qǐng yòng gōngkuài jiā shícái.

Yes, here 请 is basically a polite marker meaning please.

In Chinese, 请 can have several uses, such as:

• please: 请坐 = please sit
• to invite: 请朋友吃饭 = invite a friend to eat
• to ask/request: 请问 = may I ask...

In this sentence, it is the polite please used in an instruction or notice. It makes the sentence sound courteous rather than blunt.

用 means to use.

The structure here is:

用 + tool/instrument + verb

So:

• 用公筷夹食材 = use public chopsticks to pick up the food ingredients

This is a very common Chinese pattern. For example:

• 用筷子吃饭 = eat using chopsticks
• 用笔写字 = write with a pen
• 用手机拍照 = take photos with a phone

So 用 introduces the thing you use to perform the action.

公筷 means public chopsticks or serving chopsticks.

Breakdown:

• 公 = public/shared
• 筷 = chopsticks

These are chopsticks meant for taking food from a shared dish, instead of using your own personal chopsticks. This is especially common in shared-meal settings such as:

• family-style dishes
• hotpot
• buffet-style serving
• restaurants emphasizing hygiene

So 公筷 are not the chopsticks you eat with directly; they are the shared chopsticks used to transfer food from common plates.

夹 here means to pick up / grasp with chopsticks or a similar tool.

It is the natural verb to use when talking about taking food with chopsticks from a plate or pot.

For example:

• 夹菜 = pick up dishes/food with chopsticks
• 夹一块肉 = pick up a piece of meat

English often just says take or pick up, but Chinese often chooses a more specific verb depending on the action. Since chopsticks are involved, 夹 is very appropriate.

食材 means food ingredients.

It usually refers to ingredients used in cooking or ingredients being prepared/eaten, rather than food in the most general sense.

Examples of 食材:

• meat
• vegetables
• mushrooms
• seafood
• tofu

In a context like hotpot or a restaurant notice, 食材 often refers to the items you pick up from shared plates or from the pot.

Compared with some related words:

• 食物 = food in general
• 菜 = dishes / cooked dishes / vegetables depending on context
• 食材 = ingredients, often a bit more formal or specific

So here 食材 sounds natural if the sign is talking about ingredients in a shared dining setting.

Chinese often puts the tool before the main verb when using 用.

The pattern is:

请 + 用 + tool + verb + object

So here:

• 请 = please
• 用公筷 = use public chopsticks
• 夹 = pick up
• 食材 = food ingredients

This order is very normal in Chinese.

Compare:

• 请用勺子喝汤 = please use a spoon to drink soup
• 请用手按按钮 = please use your hand to press the button
• 请用手机扫码 = please use your phone to scan the code

So the sentence is structured very naturally.

Yes. There are several natural variations depending on tone and formality.

For example:

• 请用公筷夹菜。
  More everyday: Please use public chopsticks to pick up the dishes/food.

• 请使用公筷。
  Shorter and more formal: Please use public chopsticks.

• 请用公筷取食材。
  Slightly more formal; 取 sounds more like take/select.

• 请使用公筷夹取食材。
  Very formal, sign-like wording.

The original sentence is already perfectly natural, especially for a notice in a restaurant or dining area.

Yes, it can sound a bit more formal or sign-like than everyday speech.

In casual conversation, people might more often say:

• 夹菜 = pick up food/dishes
• 拿菜 = take food
• 夹一点肉 = pick up some meat

But on signs, menus, restaurant notices, and public health reminders, 食材 is common because it sounds precise and neat.

So:

• everyday speech: often 菜
• notices/instructions: 食材 is very plausible

Here 夹 is pronounced jiā.

That is the common pronunciation when it means to clip / press between / pick up with chopsticks.

This character has multiple pronunciations in Chinese, which can confuse learners. But in this sentence, jiā is the correct one.

So:

• 夹食材 = jiā shícái

Yes, it can.

Without 请, the sentence becomes more direct:

• 用公筷夹食材。

That still works, especially on signs or instructions. But adding 请 makes it more polite and more natural for public notices.

So the difference is roughly:

• 请用公筷夹食材。 = polite request
• 用公筷夹食材。 = direct instruction

In public-facing language, 请 is very common because it softens the command.

It is especially likely to appear in written instructions or on a sign, for example in:

• a restaurant
• a hotpot place
• a buffet area
• a cafeteria

It sounds polite, clear, and slightly formal, which fits public notices well.

Someone speaking casually might choose a simpler version like:

• 请用公筷夹菜。

But the original sentence still sounds natural and understandable in speech too.