A1 at the back (of)在(…的)后面
More examples
The police officer was hidden out of sight behind a tree.
The guard dog was snarling and snapping behind the fence.
She tucked a loose strand of hair behind her ears.
She heard a sudden noise behind her, and swung round to look behind her.
After the third lap, she was way behind the other runners.
B1 in the place where someone or something was before(遗留)在后面;(留)在原处
C1 slower or later than someone else, or than you should be比…迟,比…慢,落后于
C1 responsible for or the cause of是…背后的原因
the part of the body on which a person sits屁股
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