In most states, first-degree murder is defined as an unlawful killing that is both willful and premeditated, meaning that it was committed after planning or "lying in wait" for the victim.

在大多数州，一级谋杀被定义为蓄意且有预谋的非法杀害，即在预谋后实施或“伏击”受害人的犯罪行为。

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In the judicial practice that the case of explosion is handled, certain difficulty has been in the delimitation of crime of willful and malicious injury and crime of murder.

在爆炸案件审理的司法实践中，故意伤害罪和故意杀人罪的界定存在一定难度。

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