名词
中文翻译：足弓
同义词：
['arch', 'metatarsal', 'metatarsophalangeal joint']
例句：
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1. The astronaut landed on the moon with his foot in the air.
宇航员在月球上着陆时，他的脚悬在空中。
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2.He had to remove his shoes to fit into the narrow space.
他不得不脱掉鞋子，才能进入狭窄的空间。
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3. The astronaut's foot was badly injured during the landing.
宇航员的脚在着陆时严重受伤。