a trade block的用法和样例：
- Britain concluded a trade agreement with China.
- He has never belonged to a trade union.
- We have a trade surplus of 400 million.
我们有 4 亿英镑的贸易顺差。
- A trade, profession, or other means of livelihood.
- The trade minister with a trade mission pay a visit to that country.
- They contracted a trade agreement with Japan.
a trade block的相关资料：