查询词典 if necessary

7 Get Gerber file, bare board, PCBA sample and unit sample if they are necessary

取得PCB电子文件，空线路板，样品线路板和样品整机如果必需的话。

By the words, necessary of life, I mean whatever, of all that man obtains by his own exertions, has been from the first, or from long use has become, so important to human life that few, if any, whether from savageness, or poverty, or philosophy, ever attempt to do without it.

所谓生活必需品，在我的意思中，是指一切人用了自己的精力收获得来的那种物品：或是它开始就显得很重要，或是由于长久的习惯，因此对于人生具有了这样的重要性，即使有人尝试着不要它，其人数也是很少的，他们或者是由于野蛮，或是出于穷困，或者只是为了一种哲学的缘故，才这么做的。

I suppose if there's nothing scandalous to report, it's necessary to make things interesting.

我推想，可能是如果没有什么不体面的事情可报道，就有必要捏造出一些有趣的事情。

For my calendar I've added the abbr attribute to provide screen readers the necessary info on the day names on top 'S','M','T' etc. But I wonder, abbr is meant to give an abbreviation, and in my case it is the opposite around, so I'm wondering if this done correctly.

如果你已经看过了我的代码，那么也一定看到了我所使用的表格元素，因为在日历中用的是列表数据，所以从语义学上来说应该用表格元素。

If you feel it is necessary, you can buy a scrim ear net at most tack shops to protect him.

如果你觉得必要，你可以多数马具店里买一副麻制耳罩来保护你的马。

If the customer's want add sealer it is necessary to add.

如有的客户要求石材要防水，就要加上防水的膜。

If the water contains sand, gravel or small stones, it may be necessary to use sedimentation ponds.

如果水中含有沙子、砂砾或较小的石块，可能有必要使用沉积池。

These feelings of insecurity and self-doubt are both unavoidable and necessary if we are to change and grow .

这种感情不安全和自我怀疑的感情是不可避免的，并且是必要的如果我们要成长的话。。

The feeling of insecurity and self-doubt are both unavoidable and necessary if we are to change and grow.

不安全和自我怀疑的感觉都是不可避免的也是必要的，我们要改变和成长。

These feelings of insecurity and self-doubt are both unavoidable and necessary if we are to challenge and grow.

这种不安全感和自我怀疑都是不可避免的，必要的，如果我们想要挑战和成长。

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。