Wales has introduced special low speed limits to minimize pollution.
威尔士已经推行了特殊的低速限制以把污染降低到最低水平。
They briefly came into contact at a very low speed while submerged.
它们主要是在潜入水中时低速接触彼此。
Luckily the train had been running at low speed following several hold-ups between stations.
幸亏有这一操作,使得列车在车站之间的几次拦截后以慢速行驶。
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