Because these things are unpaired, we have already seen how unpaired electrons play a role in the Stern-Gerlach experiment.

因为这些事物都是未成对的，我们已经发现在 Stern-Gerlach 实验中，未成对电子扮演怎样一个角色了。

The country needs new leadership if she is to play a role in future development.

该国要在未来的发展中发挥作用的话，她就需要新的领导班子。

We sincerely hope that WWF can play a role in protecting this endangered species.

我们真诚地希望世界自然基金会能在保护这个濒危的野生物种中发挥作用。

Will China plan to play a role in SAARC?

中国是否打算在南盟中发挥作用？

He was invited to play a role in this TV play.

他被邀请在这个电视剧里扮演一个角色。