1.
Tighten or replace components as necessary.
必要时扭紧或更换部件。
2.
You decided what to do yourself and, if necessary, you lead the crowd.
“你必须保持主见，必要时，破浪而行。”
3.
Is it necessary to weed now and then?
是不是有必要时不时除除草？
4.
Must pass the agreement notarization above all, when necessary judicatory adjudication.
首先必须将协议经过公证，必要时司法裁决。
5.
If need be , I can do extra work at the weekend
必要时我可以在周末加班
6.
At a pinch this can be used as a weapon.
必要时，这家伙可当武器用。
7.
"If necessary, I will go myself."
“在必要时，我还可以自己去。”
8.
We can put up ten people for the night at a pinch.
必要时我们可以留宿十个人。
9.
They can put up at least 6 people for the night at a pinch.
必要时他们至少可以留宿六个人。
10.
REPAIR THE FUSED B CKT AS NECESSARY.
必要时修理熔断Ｂ（+）电路。＊
11.
You must be there on time.
你务必要按时到达那里。
12.
It was now necessary for them to go into hiding.
这时他们有必要藏起来。
13.
Prompt action is indicated in a crisis.
危急时必需要迅速行动。
14.
That was necessary at the time.
当时反右是必要的，
15.
It's necessary to buckle the belt when driving
开车时系上带子很必要。
16.
On the Necessity of Sticking to Two Principals Without Fail in New Era;
论新时期坚持“两个务必”的必要性
17.
Take time when time cometh, lest time steal away.
时来必须要趁时，不然时去无声息。
18.
In times of necessity, you comrades present here will have to live in sheds.
在必要的时候，在座的同志们要住棚子。