Once an opportunity slips away, it has gone for good and ever.机会一旦错过,永远不会再来。
You should go and see this film if you get the opportunity.如果有机会你应该去看这部影片。
He sought opportunities of doing her little service.他寻找机会为她尽一点力。
I have had not opportunity to give him your message.我还没有机会把你的口信捎给他。
