The self-access material is one piece of software which could be used in many different ways to do exercises and to learn vocabulary.
自主学习的材料是一个可以用不同的方式来做练习和学习词汇的软件。
This volume shall temporarily be available for self-study only; the student shall pay USD50 to access this material online.
本册教材暂时为自学阅读教材，交纳50美元费用即可在线阅读。
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