The lower compartment was full except for an oblong of empty space where something had been taken out.

下层隔间是满的， 只有一个长方形的空间被取出来了。

'Something has been taken out of the lower compartment, and I can't find anything that fits the space.

‘下层隔间的东西被拿走了， 我找不到适合这个空间的东西。

He saw his bicycle embarked, slung his knapsack into the lower compartment of the car, and followed it in.

他看到自己的自行车上了车，将背包挂在车厢下部，也跟了进去。