In 1941, the train would have been pulled by a steam engine.1941年，火车本可以由蒸汽机车拉动。He lost a foot when he was struck by a train.他给火车撞伤，失去了一只脚。Businesses need to train their workers better, and spend more on R&D.各企业需要更好地培训工人，...
The Monarch Butterfly breathes through its wings and female Monarchs have thicker wing veins.帝王蝶通过翅膀呼吸,雌性帝王蝶有更加厚实的翅膀脉络.Overall a monarch butterfly is no more or less striking than its host, the milkweed pod.大体上,帝王蝴蝶和其宿主奶...