Contratest
a. 对照试验的
🗣️ 情景例句
Now, we always use different packing for different goods.
我们一向是不同的货物用不同的包装。
You'll be on air in two minutes.
两分钟以后你会上电视。
Excuse me, Miss Yang. I've just found this library book.
“打搅了，杨小姐。我刚刚捡到这本图书馆的藏书。”