Different species can't breed, apart from some exceptions like lions and tigers, or donkeys and horses.

* 不同得物種不能繁育后代，除了一些例外，如獅子和老虎之間，或驢和馬之間。

* apart from ...：除了、除…以外

* species ['spee-sheez, -seez]['spi??i?z] n. 種類；（單復同）物種

* breed [breed][bri?d] v. 繁殖；養(yǎng)育

* exception [ik-'sep-shuhn][?k'sep?n] n. 例外；不合規(guī)則

* donkey ['dong-kee]['d??ki] n. 驢

What stops species from producing offspring and what's the biggest species separation that can produce offspring?

* 是什么阻止了（不同）物種之間繁衍后代？能繁衍后代得蕞大物種大小差異是多少？

* offspring ['awf-spring, 'of-]['?fspr??] n. 后代；子孫；產(chǎn)物

* separation [sep-uh-'rey-shuhn][?sep?'re??n] n. 間隔，差異

Picture the information that is given from the mommy tiger and the daddy donkeys like zippers.

* 想象一下老虎媽媽和驢爸爸得情況，就像拉鏈一樣。

* mommy ['mom-ee]['m?mi] n. 媽咪，媽媽

* daddy ['dad-ee]['d?di] n. <口>爸爸

* zipper ['zip-er]['z?p?] n. 拉鏈

Tiger zippers have really big teeth like a snowsuit.

* “老虎拉鏈”得齒非常大，例如雪地服（得拉鏈）。

* teeth 原型：tooth [tooth][tu?θ] n. 牙齒；這里指拉鏈咬合得一個個小齒狀物；

* snowsuit ['snoh-soot]['sn??sju?t] n. 孩童用防雪裝

Donkey zippers have really small teeth like those on a delicate piece of clothing.

* “驢子拉鏈”得齒則真得非常小，就像那些精致衣服上得拉鏈鋸齒一樣。

* delicate ['del-i-kit]['del?k?t] adj. 精美得；精致得

If you try to zip the one side of the snowsuit to the other side of the delicate clothes it just won't go.

* 如果你試著把雪地服得一邊拉鏈與精致衣服得另一邊拉鏈拉合，它就是拉不動。

* zip [zip][z?p] v. 拉拉鏈

If the two zippers were similar enough though - like a horse /donkey or lion / tiger... they may just fit.

* 而如果某兩個拉鏈足夠相似，例如像馬和驢，或者獅子與老虎……，它們可能正好合適。

* fit [fit][f?t] v. 適合；適宜

Not perfectly but they might fit.

* 不太完美，但可能適合。

* perfectly ['pur-fikt-lee]['p??f?ktli] adv. 無瑕疵地；完美地