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Great Britain had large amounts of coal; however, there were not yet efficient means by which to produce mechanical energy or to power machinery.

英国有大量的煤；然而，当时还没有有效的方法来产生机械能或为机器提供动力。

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In Dujiangyan, a large mechanical digger scoops slabs of concrete and twisted metal rods from a massive pile of rubble.

在都江堰，一台大型挖掘机从一大堆碎石中铲出混凝土板和扭曲的金属杆。

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He said the Earth is like a large mechanical device that will survive only if people living on it know how to operate it correctly.

VOA: special.2010.05.30

There are some large companies like from where I'm from that hire mechanical engineers.

有许多像我家乡的几家大型公司，都招聘机械工程师。

就业很难 - SpeakingMax英语口语达人

By the end of the 13th century, Italian engineers were building large mechanical clocks inside towers, driven by slowly descending weights.

FORBES: No. 11 The Watch

Large mechanical rollers shape pool-cue sized rods of silver, there's the sound of metal being worked, and the smell of gas in the air.

BBC: How tech is transforming jewellery

Huts 11 and 11A at the Buckinghamshire museum were the first to house the large electro-mechanical Bombe devices, which decrypted German military messages during World War II.

BBC: Bletchley Park Enigma code hut to be restored