1.炮火齐射（名词）；2.爆发（名词）

1. (noun). A discharge of many guns at the same time or in rapid succession.

2. (noun). A rapid outburst that continues intensely.

1.EXAMPLE: The battle began with a fusillade of rifle shots from the top of the fortress wall.

这场战斗始于城堡墙头的一阵步枪齐射。

2.EXAMPLE: As soon as the store opened its clerks were faced with a fusillade of angry complaints from unhappy customers.

这家商店一开门，店员就迎来了来自不满意客户们的一通愤怒投诉。

to camp on the doorstep of someone

纠缠（成语）

(IDIOM) To insist on getting someone's attention until he or she agrees to do something.

EXAMPLE: I know he is busy, but I urgently need guidance, and I will camp on the doorstep of my boss until he answers the important question I asked him last week.

我知道他很忙，但我急需要指导。所以，我缠着我的老板，直到他答复我上周问他的那个重要问题。