This is a very helpful and informative book.
这是一个非常有益的和内容丰富的书。
Therefore, it could be helpful to use a dictionary while you read this book.
因此，当你读这本书的时候用词典会有帮助。
Some helpful exercises include taking a hot bath or reading a book in low light.
那些简单的活动包括洗热水澡或在柔光中阅读。
The book is our good teacher and helpful friend, resemble a friend of intimate.
这本书是我们的良师益友，就像亲密的朋友。
The book is our good teacher and helpful friend, resemble a friend of intimate.
这本书是我们的良师益友，就像亲密的朋友。
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