The onsets were closely timed.是什么意思？

The onsets were closely timed.

进攻一轮紧接着一轮.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

onsets

n. 攻击，袭击（onset的复数形式）；

例句
The onsets were closely timed.
进攻一轮紧接着一轮.

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

closely

adv. 接近地，紧密地，严密地，亲近地；

例句
...a closely contested regional flower show.
各方争奇斗艳、难分高下的地区花卉展

timed

同步的，定时的，时控的；

例句
This change has been timed under laboratory conditions...
在实验室条件下测得了这一变化所需的时间。