I can take the car if necessary.

如果必要的话，我可以乘汽车去。

If necessary I can come at once.

如果有必要，我可以马上来。

If necessary , you can contact me at home.

必要的话，我在家时你也可以和我联系。

If necessary the patient can then visit his doctor for further advice.

如果必要的话，病人可向自己的医生咨询以得到更多的建议。

I may look like a tenderfoot, but I think I can follow a trail or carry a pack if necessary.

我也许看起来像个新手，不过有必要的话我认为我也能跟着上路或扛包。

I could visit home every few months if necessary.

如果有必要，我可以每隔几个月回家一次。

If necessary, we can use aluminum instead of steel.

如果必要，我们可用铝代替钢。

If necessary, we can use aluminium instead of steel.

如果必要，我们可用铝代钢。

They were ready to die, if necessary, for their country.

必要时，他们愿为国捐躯。

Such a system could, if necessary, move troops quickly from one area to another.

如果有必要的话，这样的系统可以使部队迅速地从一个地区转移到另一个地区。

The banks would be required, if necessary, to identify the origin of foreign funds going into numbered and other accounts.

如有必要，银行将被要求查明进入编号账户和其他账户的外国资金的来源。

We will use air power to protect UN peacekeepers if necessary.

必要时我们会动用空军力量来保护联合国维和部队的安全。

It's reassuring (to know) that we've got the money if necessary.

我们有了应急的钱，这就不必担心了。

The doctors will operate if necessary—but it may not come to that.

必要时医生会施行手术，但也许还不致如此。

British and American warships are standing by to evacuate their citizens if necessary.

英美战舰已做好准备一有必要就撤出本国公民。

So you're saying this will strengthen the American public's resolve to go to war if necessary?

那么你是说，这将会坚定美国公众在必要时参战的决心？

A dictionary may also be helpful if necessary.

必要的时候，字典也会很有用。

I can show you how to do it if necessary.

如果有必要，我可以告诉你怎么做。

If necessary, just take a deep breath and smile before speaking.

如果有必要，就在说话前深呼吸并微笑。

Teachers say that they give individual help at the end of a lesson or after school, setting extra work if necessary.

教师们表示，他们会在课程结束或放学后给予个别学生另外的辅导，必要时还会安排额外的作业。

I: If necessary there will be.

如果需要的话，会有的。

If necessary, I will go myself.

在必要时，我还可以自己去。

Change the icon if necessary.

如有需要更改其图标。

Bend your knees if necessary.

若有必要，可以屈膝。

Take them to clubs if necessary.

如果需要的话带他们去俱乐部。

If necessary, use glue gun.

必要地时候，上喷胶枪。

Open the server view if necessary.

如有必要打开服务器视图。

If necessary, you might call in sick.

必要时你可以打电话请病假。

Add input parameters, if necessary.

如果需要的话添加输入参数。

Transfer database if necessary.

必要的话，迁移数据库。