Helixin
螺菌素
🗣️ 情景例句
The first word is snow.
第一个字是 雪 。
All is not at hand that helps.
有用的东西并不都是垂手可得的。
Sally was very excited because she had never travelled on a train before.
萨莉非常激动，因为她从未乘过火车。