英语口语：每日一图第53期 snail 

A snail can slide over a razor blade without being hurt by producing slime that helps it slide harmlessly.

蜗牛可以爬过锋利的刀刃就不受伤，是因为它分泌的粘液起了润滑保护作用。

每日听力朗读练习:
[ə] [sneil] [sneil] [slaid] ['əuvə] [ə] ['reizə] [bleid] [wi'ðaut] ['bi:iŋ] [hə:t] [bai] [prə'dju:siŋ] [slaim] [ðæt] [helps] [it] [slaid] ['hɑ:mlisli].

每日单词扩展：snail
nail指甲；钉子
snail蜗牛