Yì wéndào kǎoròu de xiāngwèi, wǒ jiù rěnbuzhù liú kǒushuǐ.
As soon as I smell barbecue, my mouth starts watering.
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Babies, sleepers and dogs drool literally. Figuratively anything can make you drool: 看得直流口水 "drooling just looking at it", said of food, cars or someone else's salary.