他们想让班上所有人都保守这个秘密（keep something to oneself)
问题描述：
他们想让班上所有人都保守这个秘密（keep something to oneself)
答
they want to let all the people in the class keep the secret just to themselves.
答
They wanted all the students in their class keep the secret to themselves.
答
they want all of the students in this class to keep the secret to themselves
答
they want all of the people in the class to keep the secret to themselves