The appropriate key(s) will be shaded to indicate the type of attack(s) each technique helps to prevent.

对于每种技术，适当的方块将加上底纹，表示这种技术有助于防范的攻击类型。

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The four squares will be shaded as appropriate to represent the type of attack this technique helps to prevent

这四个方块加了适当的底纹，以代表这种技术有助于防范的攻击类型

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