带上你的外套以防下雨。
dài shàng nǐ de wài tào yǐ fáng xià yǔ.
Take your coat in case it rains.
以防下雨你最好带把伞。
yǐ fáng xià yǔ nǐ zuì hǎo dài bǎ sǎn.
You had better take an umbrella with you in case it rains.
随时按 ? 打开。