Usages of bàotāi
自行车 爆胎 了， 别 马上 刹车。zìxíngchē bàotāi le, bié mǎshàng shāchē.
The bicycle has a flat tyre; do not brake immediately.
她 之所以 带 打气筒， 是 因为 自行车 爆胎 了。tā zhīsuǒyǐ dài dǎqìtǒng, shì yīnwèi zìxíngchē bàotāi le.
The reason she brought the bicycle pump is that her bicycle had a flat tyre.
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