他们的发现给人们带来了延长寿命的希望，也开启了衰老相关疾病方面一个全新的医学研究方向。

It also led to an entirely new line of medical research into age-related conditions.

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如果是相反方向，半导体闸流管无法开启。

In the reverse direction the thyristor cannot be turned on.

youdao

如果是相反方向，半导体闸流管无法开启。

In the reverse direction the thyristor cannot be turned on.

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