机械摆钟是____与____联合工作的。
摆锤
齿轮操纵器
It's 11: 00 pm now, but the light in Peter's room is still on. He must have forgotten _______ before going to bed.
下面漫画《招生》，反映了当今教育不公平的现象。这幅漫画集中体现了（ ）
