1. 在行驶中：under separate cover 在另函中 | under steam 在行驶中 | under stress of weather 迫于恶劣的天气
2. 用蒸汽机航行：under shore 在用支柱撑着的情况下 | under steam 用蒸汽机航行 | under the control of 在...控制下
3. 被汽力推动着, 在航行中拿出精神：under its [her] own steam (指船)依靠本身的蒸汽力; 恁自己的力量, 不靠别人的帮助 | under steam 被汽力推动着, 在航行中拿出精神 | with all one's (full) steam on 开足马力
4. 某事正在进行中：steam up 使. . 蒙上蒸汽 | under steam 某事正在进行中 | under one's own steam 独立地
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1. Except for the steam turbine plant in Mianzhu, other plants under the company have started operation.
2. Local residents had reported steam rising from the pavement earlier and pipe repairs were already under way further along the street.