需要时

The bonds, which were introduced in 1956, are in units of one pound and are redeemable at face value on demand.

这种债券始于1956年，以一英镑为单位，需要时可按面值兑现。

Retrievable – Every record should be filed and stored in such as way as to be easy to find and access when needed.

检索——每个记录应以这样的方式归档和储存，即需要时容易发现和存取。

Data management is referred to storing data in such a way that they can be retrieved when needed.

数据管理是指在需要时，可将数据调出的数据存储方法。

The transmission also has the function of the power output if required because of the free gear and reverse gear.

变速器设有空档和倒档，需要时还可以输出动力。

When necessary, others I will roll up their sleeves to help him.

当别人需要时我一定卷起袖子帮助他。

This allows the user to accurately and consistently apply sealer to the part only where required every cycle.

让用户尽在每个循环需要时，精确而连贯地将粘合剂涂抹在工件上。

The CDC has created what's called "seed stock" of the new virus that manufacturers would need to start production.

美国疾控中心已经建立了新型病毒的"疫种储备"，在需要时可以用来生产疫苗。

Values; the results of the dye spot test or admittance measurement, as applicable

需要时，染斑试验或导纳测量的结果

Be able to squeeze into the bottle with milk on the refrigerator, such as when required after hot feeding.

能将奶挤入奶瓶内放到冰箱，等需要时温热后喂养。

The process can be stopped at any time, and can be resumed whenever needed.

这一过程可以在任何时候停止，并且可以在需要时恢复。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷