How much are the two butterflies? this is a good sentence for a price. take it!
如果可以单卖，但是你想买两个，那当然看成复数更好。
'Like walking in a quiet forest being followed by two butterflies,' exclaims the other brother.
就好像漫步在一片宁静的树林里，身后有两只蝴蝶如影相随。
It's surrounded by a white butterfly Innocent Steps forward, and then again one, two butterflies together to dance.
它的周围有一只白蝴蝶翩翩着，接着又来一只，两只蝴蝶一起跳起舞来。
It usually takes the butterflies two months to reach Mexico.
蝴蝶通常需要两个月才能到达墨西哥。
Two of our rarest, and most graceful, butterflies are on the wing this weekend.
本周末有两个稀有而最优雅的蝴蝶在展翅飞扬。
Found in the Eastern side of the US, this butterfly often produces two or three batches of eggs each year which puts it among the more fecund of butterflies.
虎凤蝶在美国的东部可以发现，这种蝴蝶通常每年产卵两到三次，这使它位列最多产的蝴蝶之一。
Almost two-thirds of species, including many birds, frogs, butterflies, trees and grassland flowers, breed or bloom earlier.
近三分之二的物种,包括一些禽类、青蛙和蝴蝶，树木以及草原上的花朵都比以往更早地开花结果，繁衍后代。
Scientists studied the butterflies in captivity. The two types differ in just one gene responsible for color.
科学家们在实验室里对这些蝴蝶进行了研究，他们发现这两种蝴蝶只有一种基因不同，也就是决定颜色的那种基因。
Butterflies welcomed two new students and one visitor to the Butterfly class today.
本周我们蝴蝶班迎来了两位新同学和一位试听的同学。
He spent two years researching different types of butterflies.
他花费两年的时间研究各种各样的蝴蝶。
Last night when I close my eyes I saw two Monarch Butterflies, dancing and playing over a lush green meadow finally free, finally happy to live their own life!
昨夜，我合上眼睛的时候，两只黑脉金斑蝶映入视线，在匆匆郁郁的草坪上翩翩起舞。终于，他们终于自由自在了；终于，他们终于过着自己的生活了！
The measure came after two German tourists were caught trying to leave the country with 15,000 preserved butterflies and moths in their luggage.
在两名德国游客试图将藏有15000只禁止出境的蝴蝶和蛾子的行李携带出境时被海关查获之后，推出了这项措施。
Morphology of immature stages and biological characteristics of two papilionid butterflies, Papilio memnon L.
记述了美凤蝶和玉斑凤蝶的幼期形态特征、成虫和幼虫的主要习性。
Morphology of immature stages and biological characteristics of two papilionid butterflies, Papilio memnon L.
记述了美凤蝶和玉斑凤蝶的幼期形态特征、成虫和幼虫的主要习性。
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