双方贸易的英文：
mutual trade

参考例句：

The treaty gave(a)fresh impetus to trade.
这条约使双方的贸易又推进了一步.

mutual是什么意思：
adj. 相互的，彼此的；共同的

They have a mutual dislike of each other.
他们都不喜欢对方。

We were introduced by a mutual friend.
我们一个共同的朋友介绍我们认识了。

The same should be true of mutual concessions.
互让也是如此。

The country agreed to confederate with the neighboring country for mutual safety.
这个国家同意为了共同的安全而与邻国结盟。

It is necessary for men to enter into a compact mutually among themselves
人们之间有必要共同缔结一种契约。

trade是什么意思：
n. 贸易；生意；交换；职业；手艺
v. 交易；对换；用…进行交换

Jack of all trades is of no trade
万事皆通,一无所长

the trade in pornography
色情作品的交易.

Foreign trade departments handle export and import trade.
外贸部门经营进出口业务。

custom of foreign trade.
对外贸易惯例

A businessperson engaged in retail trade.
从事零售交易的商人。