英语翻译1.It is a large,triangular area of the ocean with the is

（都是我自己翻译的,仅供参考吧!）
1.It is a large,triangular area of the ocean with the island of Bermude at its northern tip.除翻译句子外,说一下句中的its是指谁?是指area还是ocean?
答：“它是以北部的百慕大群岛为一个顶点的大三角形水域.”
its指三角形水域area因为这个三角形水域是以迈阿密、北部的百慕大、南部的波多黎各为顶点的.
2.This latest theory has yet to be proved but seems to offer a better explanation as to why Flight 19 and all the other planes,ships and people have disappeared in the Bermuda Triangle.其中的a better explanation as to why 是个什么结构?
答：“最新的推测得到了证实,但是对于19号航班以及所有飞机、轮船和人为什么会在百慕大三角失踪,似乎提供了一个更好的解释.”
as to “至于,关于”
3.Pretty small,according to biologists-about the same chance that you would have of winning the national lottery five weeks
in a row.除解释本句外,说一下句中的have
答：“又漂亮有小的,根据生物学家（所说）——你必须连续五个星期都中奖这样的机会.”
have of：“需要”
4.I am not going into the forest after bear cubs.课本上的解释是be after=be looking for,但是仔细阅读发现,句子中只有一个系动词,是跟going搭配的,并没有系动词跟after搭配.怎么回事?
答：“我没有进森林去寻找幼兽.”
确实be...after=be...looking for,going只是在be动词后面要用动名词.
5.No sooner had the younger brother gone into the forest than he found the river,swam across it.
答：“小弟弟一进入森林就发现了河,游了过去.”
no sooner ...than：“一……就……”
6.Because all reasons for keeping the secret have disappeared,this report has been reconstructed from Tom's own article.
答：“由于所有保密的原因已经消失,Tom文章上的报道已经重写了.”
7.The planting of several different crops improves the soil and helps prevent erosion.句子中的help直接加动词是什么结构?什么意
答：“几种不同农作物的种植改善了土壤且防止了腐蚀.”
improves the soil与helps prevent erosion是并列结构,主语是The planting,所以improve和help都加s,表示第三人称单数.
8.In fact,only a slight plowing is necessary if proper methods are used.
答：“事实上,如果用适当的方式,只要浅耕就行.”
slight plowing：“浅耕”
9.eat的过去式和过去分词分别是什么?
答：过去式：ate,过去分词：eaten
10.Probably about the time they began domesticating animals-some 8000 to 10000 years ago.句中的some是什么意思?
答：“或许大约在这个时间他们开始驯养动物的——就是大约8000到10000年前.”
some：“大约”
11.The production of milk in many countries is now a large,scientifically based,highly mechanized industry.除解释本句外,再说一下句中的based是什么意思?什么词性?
答：“现在,许多国家的牛奶生产是大量的、科学方法基础上的、高机械化的工业.”
large,based,mechanized都是修饰industry的形容词,“有基础的”
12.Up until then they had depended for their lives on their luck in hunting,fishing and finding wild plants that they could eat.句中的depended for their lives on 我记得depend on 是个词组啊.
答：“那时,他们为了维持生活而打猎、钓鱼、找能吃的野生植物都得靠运气.”
depend on：是一个词组“依靠”,但是它们中间的for their lives是插入语,只是说因为什么而依靠运气,可以这么用.
up until then：后跟过去完成时.
13.Being able to grow a part of their own food meant that starvation was no longer such a danger.句中的such a danger是什么意思
答：Being able to grow a part of their own food“能种植他们自己的部分食物”作主语,
meant 是谓语动词,
that starvation was no longer such a danger 宾语从句,
全句意思“能种植他们自己的部分食物意味着饥饿不再如此危险.”
such与such a的区别：
它们都是“如此的……”
such+不可数名词
such a+可数名词单数
14.Grain was pulled up by the roots.解释一下句子的意思,分析句子的结构.
答：“谷物被连根拔起.”
此句为被动语态,pull up by the roots是“连根拔起”的意思.