n.毅力 ，韧性，不屈不挠的精神...

sever的现在完成时为：severed...

He asseverated that he had seen a flying saucer.他坚持说,他看见了飞碟....

severely的最高级为：most severely...

塞文河...

She wanted to sever all her connections with the firm.她想断绝和那家公司的所有联系.sever a relationship断绝关系The world can be changed by man's endeavor, and that this endeavor can lead to something new and better .No man can sever ...

vt.郑重声明，断言...