He explained that the father had a gun. He went through twenty minutes of the boy's preparation, step by step-the bullets, loading the gun, making a plan.
他解释说这个父亲有把枪，后来他又用了二十分钟一步步地讲男孩的准备过程——把子弹装满枪匣，然后制定计划。
For the need of loading on Passanger Ro-Ro ship, the mechanics equilibrium equation of ship floatation is used to propose the calculation method of add-weighting with step by step.
为了适用于客滚船舶配载计算的需要，根据船舶的浮态力学平衡方程，提出了船舶浮态参数按逐步加量的递进计算方法。
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