1、He'd left his book bag lying in the grass at the base of a tree.
他把書包扔在在樹干底下的草地上。

2、Ronnie sighed and stopped walking, then slung his book bag farther up on his shoulder.
羅尼嘆了口氣，停下了腳步，然后提了提肩頭的書包。

3、He set his book bag beside Tim's and stepped among the crushed weeds.
他把書包放在了蒂姆的書包旁，然后沿著被壓倒的雜草前行。