. keep themselves away from viruses because they are invisible.
远离病毒，因为它们是看不见的
Do not eat. Keep away from fire.
切勿食用，远离火源

Please keep the little boy away from the boiling water.
请不要让那男孩接近滚烫的水.

keep sb/sth from +分词
是阻止,妨碍的意思
例句与用法:
1. www.souquanme.comI hope you will keep from doing anything rash.
我希望你不要做出任何鲁莽的事情来。

2. I horse around quite a lot, just to keep from getting bored.
我胡闹了一阵儿，只是为了摆脱厌烦。

3. He was argumentatVMfZQtive, loud and just plawww.souquanme.comin rude. We bit our tongues the entire weekend to keep from telling him where to go!
他好争论，大嗓门并且毫无礼貌。整个周www.souquanme.com末我们强忍住未向他下逐客令。

4. Hearing the words, he couldn//www.souquanme.com't keep from laughing.
听了这话，他不由得笑了起来。