控制出碱浓度的因素主要有两个：生蒸汽压力和真空度。
The concentration of discharge caustic soda depends mainly on the pressure of fresh steam and vacuum.
在Malthus一生中，他能够目睹到人类农业生产力的巨大飞跃，这要感谢蒸汽机和轧棉机这些发明。
Within his lifetime, Malthus was able to witness incredible surges in mankind's agricultural productivity, thanks to inventions like the steam engine and the cotton gin.
叙述了非洲裔美国英雄的一生，他和蒸汽钻机比速度，去钻开一座山。
Retells the life of the legendary African American hero who raced against a steam drill to cut through a mountain.
叙述了非洲裔美国英雄的一生，他和蒸汽钻机比速度，去钻开一座山。
Retells the life of the legendary African American hero who raced against a steam drill to cut through a mountain.
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