✅ 同义词
🗣️ 情景例句
You have been working on this for some time, Richard.
你从事这工作已有一段时间了， Richard。
How long will the sale last?
折价销售多久？
and should not be put in drinks unless it is known to be safe.
只有知道冰块安全时才能加入饮料。