Fortunately, she knew at once what to do.

　　幸運的是，她立刻知道該做什么。

　　Fortunately, the clue is in the language itself.

　　幸運的是，線索就在語言本身。

　　Fortunately, the collision hypothesis is testable.

　　幸運的是，碰撞假說是可驗證的。