Usages of èrshí
这 家 食堂 虽然 不 大， 但是 菜 很 多， 也 不 贵， 一般 只 要 二十 块。Zhè jiā shítáng suīrán bú dà, dànshì cài hěn duō, yě bú guì, yìbān zhǐ yào èrshí kuài.
Although this cafeteria isn’t big, it has a lot of dishes and isn’t expensive; usually it only costs twenty yuan.
他 今 年 二十 岁， 妹妹 比 他 小 两 岁。Tā jīnnián èrshí suì, mèimei bǐ tā xiǎo liǎng suì.
He is twenty years old this year; his younger sister is two years younger than him.
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