You can swap out one system and replace it with another.

您可以交换一个系统并且用其它的系统替换它。

Get the oil checked, swap out the brakes, check the exhaust etc.

检查机油，换个刹车，检查排气装置等等。

You could even swap out the batteries while charging others with the phone.

你甚至可以更换出有电的电池，装入没电的电池，用手机太阳能给没电的电池充电。

And during live shows, guitarists may swap out for a new guitar with every song.

而在现场表演时，吉他手有可能为每首曲子的演出而更换一把新吉他。

Finally, you'll see how easy it is to swap out one relational database for another.

最后，将看到能够轻松地切换到另一个关系数据库。