必须的

Second, efficiencies are not an option.

其次，效率是必须的。

Normally, everyone does the necessary work and rest, with addition of sport and entertainments.

一般来说，一个人除了必须的工作与休息，还需要一些体育和娱乐活动。

Itll fight if it has to, but its vulnerable out in the open.

在必须的时候它会发威，但它在野外易受攻击。

In fact, we naturally produce the "endogenous opioids" necessary for happiness.

事实上，人会自然产生出快乐时必须的&内生阿片&。

We believe it's necessary, but you need to know the ramifications.

这是必须的但你得知道后果

Attendance in class and recitations is required.

参与教师上课及演习课是必须的。

See the toplevel example for an explanation and example of their use.

它们相当罕见但是在一些案例中却是必须的。

My mom is dead set on me going to graduate school,I guess Imust go.

我妈妈是铁定了心要我上研究生，我猜我必须的去了。

If open windows aren't enough, a ceiling light and plenty of lamps are just as good.

如果光开开窗户是不够的话，那么一个天花板吊灯可就是必须的了。

Taking place on the 9th to 11th of January in the same venue as last year, the Sport Arena in Odense, Denmark, this race is a must for all serious electric racers.

以发生在9日至1月11日在同一地点同去年一样，在体育竞技场在欧登塞，丹麦，这场比赛是必须的一切严重电动赛车。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。