earths

You could get a nasty shock from that water heater if it isn't earthed properly.

如果电热水器接地不良的话，可能会发生很严重的触电事故。

Mercury, Venus, Earth, and Mars are called "rocky planets".

水星、金星、地球和火星被称为“岩石行星”。

The ploughed earth looked rich and dark and fertile.

耕过的土地看上去黑油油的，非常肥沃。