在水下的用法和樣例：
例句
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把放在水下的石頭拿起來(lái)，你將會(huì )發(fā)現它在水下要比把它拿出水面時(shí)要輕。
Picking up a stone lying underwater, you will find that it is lighter underwater than when you lift it out into the air. -
海底（實(shí)驗室）工作人，深水操作人員訓練能在水下裝置物中生活并引導、輔助或作為科學(xué)研究的對象
A person trained to live in underwater installations and conduct, assist in, or be a subject of scientific research.
