掩护和通畅的直线︰判定目标生物是否有掩护的方法是，从攻击者所在方格到目标方格连一系列虚拟的直线。
Cover and Clear lines: To determine whether a target creature has cover, draw imaginary lines between squares in the attacker's and the target's Spaces.
构造一枚虚拟领弹按指定的攻击时间和攻击角度以直线飞向目标。
The virtual-leader is introduced, which would fly straightly to the target from the designated impact angle at the designated impact time.
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