如果你认为在书上做记号是有用的，你就得去买它们。
If you think it is useful to mark books, you will have to buy them.
倘若你同意我的观点，认为在书上做记号颇有益处，你就得自己掏钱买书。
If you decide that I am right about the usefulness of marking books, you have to buy them.
倘若你同意我的观点，认为在书上做记号颇有益处，你就得自己掏钱买书。
If you decide that I am right about the usefulness of marking books, you have to buy them.
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