中英释义：
双语例句
他花了七年工夫制造出一些能在空中航行的、精巧的船。 他用最坚固的钢制造出闪电来，因为他希望攻破天上的堡垒。
And he spent seven years in the construction of wonderful ships to sail through the air, and had darts cast from the hardest steel to break the walls of heaven with.
重点词汇
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坚固的
stable; infrangible; staunch; consistent; cast-iron; indurative; solid; hard
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堡垒
fort; fortress; stronghold; bastion; redoubt; bulwark; citadel; castle; blockhouse; ft