贸易摩擦的英文：
trade friction

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。

friction是什么意思：
n. 摩擦；摩擦力；不和，争执

family friction
家庭的不和

These two countries have political friction.
这两国政治上失和。

The rougher the surface, the greater the friction.
物体表面越粗糙，产生的摩擦力越大。

We must distinguish sliding friction from rolling friction
我们必须把滑动摩擦同滚动摩擦区别开来。

political friction between two countries
两国间政治上的不和