应用动态球腔扩张理论，建立了冲击贯入方程、冲击次数表达式和贯入阻力与贯入深度的关系。

And then a theory on the penetrating depth, the number of impact and the relation between penetrating resistance and depth was obtained by means of dynamic spherical cavity expansion.

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由此方程导出了入风流未受污染和受污染两种情况下的排氡子体风量计算公式。

The calculating formula of ventilation flow were derived from the accumulation equation for eliminating radon daughters in the inlet flow with or without contamination.

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不过，家长金属的硬度和锻炼现状掷入猴扳手，方程。

However, the parent metal's hardness and tempering current state throw a monkey wrench into that equation.

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And in terms of equations that we use, it's sometimes easier to plug in the fact, since momentum is equal to mass times velocity.

在我们使用方程这方面，事实上有时是很容易代入的，因为动量等于质量乘以速度。

麻省理工公开课 - 化学原理课程节选

I don't know where that is, that disappeared on the blackboard, then putting the time equal to 1 second into this formula.

我不知道我写在哪儿了,已经不在黑板上了,然后把时间等于1秒代入方程

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So, let's say we start off at the distance being ten angstroms. We can plug that into this differential equation that we'll have and solve it and what we find out is that r actually goes to zero at a time that's equal to 10 to the negative 10 seconds.

也就大约是这么多,所以我们取初始值10埃,我们把它代入到,这个微分方程解它,可以发现，r在10的,负10次方秒内就衰减到零了。

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