求翻译：how to change these 是什么意思? ... an investigation was made into the air-crash » 调查到空气中碰撞 Heterogeneous catalysts can be divided into two types; those for use in fixed-bed processing wherein the catalyst is stationary and the reactants pass upward (flooded-bed) or downward (trickle-bed) over it, » 不同催化剂可分为两类;这些使用的固定床处理其中的催化剂的表层是静止的和通过向上(淹床)或调低(涓滴床), Barbarian Breakout. » 野蛮断裂。 ...
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