我一看到后身就认出是他的英文

i recognized him as soon as i saw his back. the back of a garment

• 我:    I; my; me
• 一:    one
• 看到:    see; catch sight o ...
• 后身:    the back of a pers ...
• 就:    come near; move to ...
• 是:    Semantics
• 他:    he