82 为什么狗在夏天爱吐舌头？

因为常吐舌头能排汗。
tongue n. 舌头
It's useful for dogs to reach out tongues.
狗吐舌头是有用的。
heat n. 热量
It's possible to remove heat by sweating.
通过出汗带走热量是可能的。
tail n. 尾巴
It's important for dogs to use their tails.
使用尾巴对狗来说很重要。