We swapped over, and she started tearing down the hard shoulder.

我们交换了位置，她开始撕下坚硬的肩膀。

Space was really too confined to allow them all to work this spell at once; half the group observed the others for a while, then swapped over.

地方不够，一半人先在旁边看，然后交换。

You start on the windows and I’ll do the walls, then we can swap over after an hour or so.

【swap】你先从窗户开始，我来弄墙，过一个小时左右我们可以换过来。

That little comma, just there, is only needed if the, " If clause" comes first, you can swap the clauses over, and in that case, the comma isn't needed.

那个小逗号，只有在 if 子句在前面时才需要加，你可以把两个子句调换顺序，在这种情况下，不需要逗号。

If someone else is with you, swap over if you begin to feel tired, and don't stop until either a health professional takes over, or the person is definitely breathing normally.

如你开始感到疲劳，让其他在场人士帮忙，不要停止按压，直到专业救护人员接手或确定病者能正常呼吸为止。

So, what was unusual is that I told my wife: " Look, if we carry on like this, we're not going to catch the plane" .So we swapped over, and she started driving down the hard shoulder.

所以，不寻常的是我告诉我的妻子：“看，如果我们这样继续下去，我们就赶不上飞机了”。所以我们换了个位置，她开始沿着坚硬的路肩行驶。