同学你好，该知识点来自沪江网校《新概念英语第四册【天猫专享】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~

作文应该交到作业区的作业帖里，助教会批改回复的，而不是答疑区哦~
https://class.hujiang.com/17335675/homework


During 16-19th,in the world had sorts of ships sunk in the sea which might be attacked by storm or by enemy ships.
序号后面应该加上century，in是多余的，介词短语不作主语。
storms复数表示泛指，各种暴风雨

In that past,salvaging wrecks was difficult for people,so they had to let it under the sea.
let改成leave 留下，留在……
Don't leave her waiting outside in the rain. 别让她在外边雨里等着。

We can use skin diving which is diving water without any expert equipments just like swimming in pool and only with some simply tools such as water glasses and a pipe you can go finding treasure in the shallow sea.
water可以去掉，意思多余。equipment不可数，不用复数
in a pool，这里要加上冠词，pool是可数名词单数。

If you can’t find treasure?
if去掉，这里不是条件句。

Don’t worry, at least you have a good time of diving water.
diving本身就表示跳水，后面不需要加water

In the Mediterranean, there are Roman ships covering greek works of art, golden coin from Roman and spices from indian and she have slept here for about 2000years.
covering改成recovering, Greek首字母大写
Rome罗马
Indian首字母大写
she指代不清楚，前面应该有所交代，指的是什么。

off the coast of Florida, there are spanish galleons sunk in the fight of between American and spain which covered gold silver and may have clothes of soldiers, diaries of captain, swords,guns which can reflect the mighty of Spanish empire in that time.
句子首字母大写。Spanish首字母大写
between前的of多余
covered可以改成recovered
captain前加the特指
mighty形容词，改成reflect the Mighty Spanish Empire
in that time改成at that time

祝同学学习进步~