许多欧洲国家和日本的生育率已经下降到人口置换率以下，这让人们担心，劳动力短缺和生产力下降将威胁生活质量。
Fertility rates in many European nations and Japan have dropped below the replacement rate, causing concern that shortages of labor and productivity could threaten the quality of life.
因为沿底部运动的异重流与上部较轻的流体置换，必须产生一种力来克服边界阻力。
Because the stream moving along the bottom displaces the lighter fluid upward, a force must be provided to overcome boundary resistance.
AGP是一款飞机生命力设备(ase)控制器，包含单一的、有飞行资格的线路可置换单元。
The Aircraft Gateway Processor (AGP) is an Aircraft Survivability Equipment (ASE) controller contained within a single, flight qualified, Line Replaceable Unit.
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