A difficult problem in this area is how to guard against fraud.
在这区域的一个困难的问题是该如何防止欺骗。
The question caught her completely off-guard and she did not know how to reply.
这个问题令她猝不及防，不知道怎么回答。
How could you not feel a responsibility to guard it?
你又怎么会没有想要守卫这片土地的责任感？
This article gives author's own opinion on how to train the guard organizer.
本文作者对训练后卫组织提出自己的观点和培养方法。
Therefore, we should know how to remould them and guard against their destructiveness.
因此，应该善于改造他们，注意防止他们的破坏性。
Therefore, we should know how to remould them and guard against their destructiveness.
因此，应该善于改造他们，注意防止他们的破坏性。
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