1. 永久离开；抛下
If you leave someone or something behind, you go away permanently from them.

2. 留下；余留
If you leave behind an object or a situation, it remains after you have left a place.

3. 把…抛在后面；超过
If a person, country, or organization is left behind, they remain at a lower level than others because they are not as quick at understanding things or developing.

1. leave unchanged or undisturbed or refrain from taking

e.g. leave it as is
leave the young fawn alone
leave the flowers that you see in the park behind

Synonym: leaveleave alone

2. be survived by after one's death

e.g. He left six children
At her death, she left behind her husband and 11 cats

Synonym: leave

3. depart and not take along

e.g. He left behind all his possessions when he moved to Europe