In the absence of any net external forces - on a system as a whole — - as we discussed last time — the center of mass will always have the same velocity.

在没有外力，作用于整个系统时-，我们上次讨论过-，重心总是，有相同稳定的速度。

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If such economies become substantial net debtors in foreign currency, they become vulnerable to mass bankruptcy or public sector insolvency if their currency tumbles.

如果这些经济成为主要的净外币债务国，当它们货币的汇率大幅下降时，将会造成大量倒闭或公共部门无力偿还债务的情况。

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By the continuous-feeding external-heating rotary kiln, the experimental studies on the gas yield characteristics, mass balance and net energy income of the polyethylene pyrolysis were performed.

在连续给料外热式回转窑试验台上，以聚乙烯为试验物料进行了热解产气特性、质量平衡以及能量净收益的试验研究。

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In places that don't or can't spend, big numbers don't mean as much when it comes to the mass consumer Net.

CNN: ASIANOW - TIME Asia | Asia Buzz: Let's Lose the Prefix

And the proportion of the population who use the Net is far from critical mass.

CNN: THE E-TAIL REVOLUTION

Within the 24-year period, 67% of the years show negative net annual specific balances, with a cumulative mass balance loss of - 10.50 m water equivalent (w.e.).

UNESCO: Dublin Core