潜艇在海上是不会受到攻击的。
爱沙尼亚人总是在海上漂泊。
他们在海上和陆上都打过仗。
他们在海上呆了几个星期，皮肤晒得黑里泛红。
Their skin was tanned and glowing from their weeks at the sea.
威尼斯在海上，人们用船，而不是自行车或公共汽车来运输。
Venice is on the sea, and people use boats, not bicycles or buses for transport.
一些人在海上旅行时喜欢用漂流瓶发送信息。
Some people enjoy sending out their messages in bottles when they travel on the sea.
他们在海上表现得非常出色。
如果钢比水重，为什么船能在海上漂浮？
If steel is heavier than water, why are ships able to float on the sea?
如果钢比水重，为什么船能在海上漂起来。
If steel is heavier than water, why are ships able to float on the sea.
这艘船必须在海上完成，这将需要几年的时间。
The ship must be completed at sea, which will take several years.
但如今许多海豚在海上被捕捉，海豚越来越少了。
But today many dolphins are caught at sea, so less and less dolphins could be seen.
这些海浪在海上看起来不是很明显，因为它们的波长很长。
The waves are not noticeable out at sea because of their long wave length.
它们的视力比人类好，而且经过训练，能够辨认出在海上的失踪者穿着的橙色救生衣。
They have better eyesight than human and have been trained to spot orange life jackets of people lost at sea.
他是一个老人，独自在海上的一条小船上钓鱼。至今出海84天了，他一条鱼也没钓到。
He was an old man who fished alone in a small boat on the sea and he had gone eighty-four days now without taking a fish.
这些船平均每次在海上呆10天。
The boats remain at sea for an average of ten days at a time.
这艘轮船完全适合在海上航行。
在海上航行十二天后他们看到了陆地。
一个驾驶帆船的人在海上遇险需要救援。
A yachtsman got into trouble off the coast and had to be rescued.
他们在海上迷失了方向。
我们在海上航行十天之后，首次看见陆地。
第三旅在海上待命，随时准备从海上发起进攻。
在海上度过两天之后，又回到使人觉得坚实的陆地，真是惬意。
After two days at sea, it was good to be back on terra firma again.
在海上，英语是一种国际交流的语言。
At sea English is the international language of communication.
这艘船最终将被拖出港口，在海上焚毁。
The ship will finally be pulled out of the port and burned at sea.
几个世纪后的唐宋元时期，中国的杜环、意大利的马可·波罗等伟大冒险家在海上和陆上的古老丝绸之路上留下了足迹。
Centuries later, in the years of Tang, Song and Yuan Dynasties, such silk routes, both over land and at sea, great adventurers, including Du Huan of China, Marco Polo of Italy, left their footprints along these ancient routes.
另一些人因为他们的水上摩托车失灵或在远离海岸的地方沉没而被困在海上。
Others have been stranded at the sea when their scooters either failed or sank far from shore.
在海上进行商业扩张所消耗的投资规模之大，反映了这种东西向贸易所能创造的巨大利润。
The sheer scale of the investment it took to begin commercial expansion at sea reflects the immensity of the profits that such East-West trade could create.
我们会把当天捕获的鱼放到一艘漂浮的加工船里，再在船上清洗、包装和冷冻那些鱼，这些全都在海上完成。
We'd bring in the day's catch to a floating processor boat where the fish got cleaned, packaged and frozen right at sea.
在该世纪后期，科学家和技术人员开始研究烟花的实际用途，比如利用烟花帮助水手确定他们在海上的位置。
Later in the century scientists and technicians started to look at the practical purposes for which fireworks might be employed, such as using rockets to help sailors establish their position at sea.
那条船在海上漂流了6个月后找到了。
The ship was found after drifting on the ocean for six months.
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