必须的

Therefore, it is necessary that we should construct an integrated risk eduction system in school.

因此，在学校构建完整的风险教育体系不但是必要的而且是必须的。

To better human life, enlightenment is needed, but to redress it is very hard.

为了更好的人类生活，启蒙是必须的，但是救济是很困难的。

Many developers equate big budgets with higher quality, but it isn't necessarily so.

许多开发商认为巨大的投入就等同于很高的质量，但这是并不是必须的。

For erbium ion in light-emitting layer with light activated process and other chemical reaction, it is necessary to anneal the devise with high temperature in fabrication process.

为了让发光层内铒离子具有光活化及其他的化学反应的发生，在制程中热退火是必须的。

Don't be callous. Err on the side of kindness. But do be strong when you need to be.

过于恩慈必将招致错误的发生，因此，在必须的时候，你的内心一定要强大起来。

If you are serious about getting control of your finances this is a must have tool.

如果您是认真的越来越控制自己的财政这是一个必须的工具。

I will take the number and be fairly certain she will not flake.

在这种情况下，我会展示我的价值，附带必须的很少的吸引。

Flue gas and thus the realization of such acquisition is necessary is necessary.

因而实现这样的烟气采集是必要的也是必须的。

But forty percent of the students don't think so.

60%的学生认为……是必须的，而40%的学生则不这样认为。

Therefore, reduction of chain width is necessary for working with this compact freewheel,.

因此，为了配合这样紧密的飞轮，链条宽度的缩减是必须的。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。