He is bending down to tie his shoelaces.

他正弯下腰系鞋带。

I bent down and tied my shoelace.

我弯下身来系鞋带。

Hurry up. Tie up your shoelaces; we are late.

快点, 系上你的鞋带, 我们晚了。

Renwick bent to tie his shoelace.

伦威克弯腰系鞋带。