Catalyst reduction
[化] 催化剂再生
🧩 词语组成解析
🗣️ 情景例句
Are you a Republican, or a Democrat?
你是共和党人还是民主党人？
It is lost labour to sow where there is no soil.
没有土壤，播种也是徒劳。
About once a month. Not too often, because neither of us has much time. We both have too much work to do.
大约每月一次。不太经常写信，因为我俩的时间都很紧。我们都有做不完的事。