When the radon levels of the water subside and drop back to normal readings, an earthquake may occur.

当水中氡的含量下降，回到正常读数时，地震就可能发生。

youdao

When the radon levels of the water subside and drop back to normal readings, an earthquake may occur.

当水中氡的含量下降并恢复到正常水平时时，就可能发生地震。

youdao

I think there are many of us out there who feel that we are on the edge of enlightenment and then drop back to the old ways.

恐怕我们中很多人觉得在启蒙的边缘从而放弃。

youdao

But you can't yet be in it yet, because when people write to us and ask how they get in the book, we sent back a postcard saying: drop dead.

但我们还不能为现在的人撰写传记，有时人们会给我们写信,问怎么样才能纳入传记中，我们就寄回明信片，上面写着，活人无资格。

普林斯顿公开课 - 人性课程节选

Now star centre Hook is willing to drop back to fill the void left by Byrne.

BBC: James Hook happy to fill Wales full-back role

Of course, stocks could drop back to the May lows but that does not look likely now.

FORBES: The Week Ahead: How Sorry Will May Sellers Be?

An ability to read the game, beat a man, find the killer pass and drop back to defend.

BBC: Jack Wilshere ready to shine for Arsenal and England