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If the time limit of performance is not clearly defined, the obligator should be ready to perform obligations to the obligated, the obligated may put the obligator under an obligation at any time, but should give the obligator the necessary time for preparation.

履行期限不明确的，承担义务的一方可以随时向另一方履行义务，享有权利的一方也可以随时要求另一方履行义务，但应当给另一方必要的准备时间。

If this is the case, we have to take the necessary measures to prevent the occurrence of cheating behavior

如果真是如此，我们要采取必要措施，防止考试作弊行为的发生。

If your car has more than 50K miles, it may be necessary to replace the worn-out OE isolators.

如果你的车超过5万英里，可能需要更换老化的减震块。

If additional lubrication is necessary an oiler is provided.

倘若必须增加润滑，就装上一个加油器。

It is necessary to walk them in the park once a day if you want them to be healthy.

如果你想让他们健康的话，每天带他去公园散一次步是必要的。

If it were that simple, it would merely be necessary to have a one-to-many relationship between Contact and Company, but it's more complicated than that.

如果就这么简单的话，就只需要在联系人和公司之间建立一对多的关系，但是实际情况有点复杂。

The main point is don't invest in expensive reverse osmosis units if it's not necessary.

除了必要外，我们是不需要购买昂快的逆渗透设备的。

I can work overtime if it's necessary.

如果有必要的话，我可以加班。

If you've ever used a drawing program such as Paint, you already have most of the skills necessary to create an effective user interface.

假如你已使用过像画笔之类的画图程序，你就已经有了创建有效的用户界面所必需的大部分技巧。

But if America is a necessary part of the solution in Palestine, it is not sufficient.

但是在解决巴勒斯坦问题的过程中仅靠美国还是远远不够的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。