You may wonder if light is also needed for life to form.

你可能会想阳光是不是生命形成的必要条件。

It is not clear if this is needed as many travelers just fly.

还不清楚是否需要尽可能多的旅行者。

Vietnamese officials say they will be able to request the information if it is needed for an investigation.

越南官员表示，如果调查需要，他们将能够要求公司提供相关信息。

Without more knowledge about their child's learning, parents might not seek extra support for their children if it is needed.

如果没有对孩子学习的更多了解，父母可能不会在需要时为孩子寻求额外的支持。

And listening and understanding if support is needed is really important.

如果需要支持，倾听和理解是非常重要的。

Scientists could engineer cyanobacteria to alert residents if repair is needed, by glowing when oxygen or pressure levels in the habitat dip.

科学家可以对蓝藻进行设计安排，当栖息地的氧气或压力水平下降时，蓝藻就会发光，提醒居民是否需要维修。

Haddo consented, and it appears that Burkhardt's book gives further proof, if it is needed, of the man's extraordinary qualities.

Haddo 同意了， 而且如果需要的话， Burkhardt 的书似乎进一步证明了这个人的非凡品质。

At the hotel Martin's Patershof, there is even a condition that the church can reclaim the building if it is needed again, said De Preter.

“在佩特斯赫福马丁斯酒店，甚至有这样一个条件——如果再次需要的话，教堂可以收回这座建筑，”德普雷特说。