The Grallatores ( 23 species ) were nearly equal to the Natatores ( 22 species ).是什么意思？

The Grallatores ( 23 species ) were nearly equal to the Natatores ( 22 species ).

按生活型分,涉禽23种, 游禽 22种,种类几乎相等.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

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

Grallatores

n. 涉水禽类；

例句
The Grallatores ( 23 species ) were nearly equal to the Natatores ( 22 species ).
按生活型分,涉禽23种, 游禽 22种,种类几乎相等.

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。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

nearly

adv. 几乎，差不多，险乎；

例句
His increasing alignment with the Reagan administration nearly cost him re-election.
与里根政府日益紧密的关系差点让他失去了连任的机会。

equal

adj. 相等的，平等的，平稳的，势均力敌的，胜任的；vt. 等于，比得上，使相等，同样看待；n. 同样的人，相等的数量，能与之比拟的东西，（地位、实力等）相同的人；vi. 相等，相平（与out连用）；

例句
The US Constitution guarantees free speech, freedom of assembly and equal protection...
美国宪法保证言论自由、集会自由和受到平等保护的权利。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。