侥幸球的英文：
fluke

adjustable fluke angle anchor
变爪角锚

That shot was a sheer fluke.
那完全是靠侥幸击中的.

I need anchor fluke chock.
我需要一个锚爪垫。

She is not usually good at tennis;that winning stroke was a fluke.
她平时网球打得并不好，那取胜的一击不过是侥幸而已。

Passing the exam was a real fluke he didn't work for it at all.
他考试及格实在是侥幸，因为他根本没下过功夫。