These two previously isolated species coalesced because of some large climatic change.是什么意思？

These two previously isolated species coalesced because of some large climatic change.

两个以前相隔离的种因为某种大的气候变迁而接合在一起.

these

adj. 这些的；pron. 这些；

例句
There's lots of money about these days for schemes like this.
近来这类计划资金充足。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

previously

adv. 事先，以前，仓促，“previous”的派生；

例句
Spassky had never previously lost to his antagonist.
斯帕斯基以往从未输给过他的对手。

isolated

adj. 隔离的，孤独的，单独的，偏远的；v. 使隔离(isolate的过去式和过去分词)，使孤立，使绝缘，脱离；

例句
...the isolated jungle area near the Panamanian border...
靠近巴拿马边境的偏僻丛林地区

species

n. 物种，种类，类型，[逻辑] 个体；

例句
Some animal and plant species cannot accommodate to the rapidly changing conditions...
某些种类的动植物不能适应迅速变化的环境。

coalesced

v. 联合，合并( coalesce的过去式和过去分词 )；

例句
His sporting and political interests coalesced admirably in his writing about climbing.
他在写登山的文章中，把自己对体育和政治的兴趣完美地结合了起来。

because

conj. 因为；

例句
5,000 people die every year because of accidents in the home...
每年有5,000人死于家中的意外事故。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

some

det. 一些，某个，部分，相当多的；pron. 一些，若干，（数量不确切时用）有些人；adv. 大约，有点，稍微；

例句
It's not a question of some abstract concept.
这不是某个抽象概念的问题。

large

adv. 大大地，夸大地，详细地，顺风地；adj. 大的，大规模的，大型号的，广泛的；v. 玩个痛快，（尤指跳舞和饮酒）作乐；

例句
The banks would be forced to absorb large losses...
银行将被迫承受巨大的损失。

climatic

adj. 气候的，风土的，受气候影响的；

例句
...the threat of rising sea levels and climatic change from overheating of the atmosphere.
大气升温引起的海平面上升和气候变化的危险

change

vt. 改变，变更，交换，替换，兑换，换衣服（床单）；vi. 改变，转变，交换，互换，换衣，更衣；n. 变化，改变，交换，交替，零钱，找头，代替物；

例句
There'll still be a feeling abroad that this change has to be recognised.
人们还会普遍觉得这项变革早晚得接受。