Dorrclone
道尔型水力旋流器
🗣️ 情景例句
Mmm-hmm. Thanks.
嗯。谢谢。
No great loss without some small gain.
塞翁失马，安知非福。
and at the most critical juncture we took turns in watching that point.
在最紧急的时刻，我们轮流监视那段河流的险情。