I first got hooked on scuba diving when I was twelve.
12 岁时我





肺潜
。
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国国家公园 He spent a long time studying the human body, he imagined ways that people could walk on water and designed armored tanks; he invented an early parachute and a version of the helicopter, a self-propelled cart and scuba diving gear.
他也花了漫长的时间来研究人体结构,他想出一些办法使人类可以漫步
水
,为此设
出了装甲坦克,他发明了早期的降落伞和早期版本的直升机,一辆内驱的运货马车和潜水用的水肺装置。
洲
语
语情景对话