To sit on a school bus in Engpsh, you can say "to ride the school bus" or "to take the school bus." The phrase "to ride the school bus" comes from the verb "to ride," which means to sit or be carried on a vehicle, animal, or person. For example, you can say "I ride the bus to school every day" or "The kids pke to ride their bikes to the park." In Chinese, you can say "坐校车" or "乘坐校车" to express the same idea. Here are some examples with translations:

"I ride the school bus to school every day." (我每天坐校车去学校。)
"The kids love to ride the school bus to their after-school activities." (孩子们喜欢坐校车去他们的课外活动。)
"Do you have to take the school bus to get to school?" (你是不是必须坐校车去学校？)