activating by steam的用法和样例：
- The engines are driven by steam.
- Abstract : Abstract: Taixi anthracite was activated by steam in the presence of two kinds of additives, nitrate and potassium-containing compounds.
摘要 ： 研究了在硝酸盐与含钾化合物两种添加剂作用下用太西无烟煤制备微孔活性炭的试验条件。
- They were scalded by steam from the burst pipe.
- Do you run the trains on oil or by steam?
- The machinery is driven by steam.
- The piston moves by steam pressure.