At the end of the day, the science teacher was very happy because the class monitor cleaned the bus after the trip.

最后一天，科学老师非常高兴因为旅行之后班长打扫了汽车。

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After that, they took the bus back to school. At the end of the day, the science teacher was very happy because the class monitor cleaned the bus after the trip.

那以后，他们乘公共汽车回到学校，在这天结束时理科老师很高兴因为旅行后班长打扫了公共汽车。

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