恰巧的英文：
by coincidence
fortunately

参考例句：

I happened to be there that day too.
那天恰巧我也在那里。

My correspondence happens to be rigidly controlled.
我的信件恰巧受到严格控制。

polaris happens to lie almost directly over the North Pole
北极星恰巧差不多位于北极的正上方。

shellac also happened to be an effective electrical insulator
紫胶恰巧还是一种有效的绝缘物。

He was in the very place where the judges deliberated and condemned
他恰巧到了这些审判官平时商议和下判决书的地方。

coincidence是什么意思：
n. 巧合；（意见等的）相同，符合，一致

coincident accidents
同时发生的事故

That was a really creepy coincidence.
那样的巧合实在太离奇了。

A series of coincident events.
一系列同时发生的事件。

three exactly coincident rasters
三个精确一致的光栅

Their aims are coincident with ours.
他们的目标与我们的一致。

fortunately是什么意思：
adv. 运气好地，幸运地

The goddess of fortune.
命运女神

May good fortune attend you!
祝你鸿运当头！

Fortune smiled on him at last.
命运女神终於眷顾他了。

God sends fortune to fools
蠢人有蠢福

The house costs a fortune to maintain.
维修这幢房子花销不菲。