时机的英文：
occasion
opportunity

参考例句：

In due course; in time
在适当的时机

Unripe or immature.
不成熟的，时机不好的

Wolves circled around, waiting
狼在打着转，等待着时机。

This time is ripe for action.
采取行动的时机已经成熟。

wisely use the available time;Make hay while the sun shines
把握时机

High time; about time
恰当的时机

Abide one's time
等待时机

The moment has now come.
时机终于来到了。

Time will soon ripen.
时机将很快成熟。

Now, a tipping point has arrived.
现在，扭转乾坤的时机到了。

occasion是什么意思：
n. 场合，盛典；时机
v. 引起，惹起

Well, it's a big occasion.
嗯，这个场面很宏大。

On this occasion the lodge sent a carriage.
为了当晚的演出，支部派了马车来接她。

A solemn occasion; ceremonial garb.
庄重的场合；正式的服装。

It is an occasion for all the family to celebrate.
这是个值得举家庆祝的时刻。

You have no occasion to buy another car.
你没有必要再买一辆汽车。

opportunity是什么意思：
n. 机会，良机

He eagerly embraced the opportunity.
他迫不及待地利用了这个机会。

This opportunity is too good to waste.
这个机遇千载难逢，绝不能错过。

Health Opportunity for People Everywhere
各地人民均可享受的保健机会

If the opportunity for an interview with a paper arises.
如果有报纸采访的机会

Such an opportunity of exhibiting was delightful to her.
这种出风头的机会她是求之不得的。