难度：**

deal a blow to sb/sth 给与某人/某事以打击 deal 这里不是交易的意思，有“给与，施加“的意思

The sanction on economy deal a severe blow to Iran.

deal a blow to = deliver a blow to

也可以表达为：deal sb. a blow

The sanction deal Iran a severe blow.

be on board 在船上，引申为：支持

If everyone is on board for refusing sign new contract, we can negotiate with company to suspend this active.

flash-point 导火索