They always appear in pairs, don't they?

它们总是成双出，？

While two of these ships sank, they were all designed with double hulls believed to make them " unsinkable" , perhaps a mistaken idea that led to the Titanic's and the Britannic's tragic end.

虽然这两艘船沉没了，但它们都被设计成双船体，据说这种设计能使它们“永不沉没”，也许是这个错误的想法导致泰坦尼克号和不列颠号的悲剧结局。

They are easy to learn and are usually danced in couples.

这些舞蹈很容易学会，通常都是成双成地表演。

2 pair out on a Friday night, coupled. Yeah, a double date.

两情侣周五晚上出去玩玩，成双成的。是的，四人约会。

Miao people believe that swallow pairs remain faithful for life, so their presence is a favor and a blessing, bringing happiness to a marriage and good luck to a home.

苗族人笃信成双燕终身相伴不离不弃，因此他们的存被视为是婚姻幸福美满和家庭行大运的象征和祝福。

Pigeons live in pairs, and the mates are very fond of each other.

鸽是成双成地生活的, 彼此非常恩爱。

I thought I was done getting lucky tonight. So, when are you thinking of moving?

我真没想到今晚能" 好事" 成双啊，所以你计划什么时候搬？

The others paired off as before, and this arrangement left Jo companionless.

其余的人各自成双结，跟过去一样，只剩下乔无人陪伴。

Only about 3% of mammals are monogamous, and, although 95% of birds pair off (at least for one breeding season) , paternity tests have revealed that the avian world is chock-full of cheaters.

只有大约 3% 的哺乳动物是一夫一妻制，虽然 95% 的鸟类都是成双成的（至少一个繁殖季节内），但亲显示，鸟类世界充满了骗。

I was paired off with my husband, but not yet lost in the marshes of a long marriage (and, okay, not yet a tiresome fishwife).

我和丈夫成双成，还没有迷失长期婚姻的沼泽中(好，还没有成为一个令人讨厌的骂街泼妇）。

Each fibre comes in a pair and each fibre pair, at a conservative estimate, can transmit 150 million simultaneous phone calls.

每根纤维都是成双出的，根据保守的估计，每一纤维可以同时传输 1 亿 5 千万部电话的通话。

I am not sure if Martha and Jem looked more radiant in the afternoon, when they, too, made their first appearance.

我不确玛莎和杰姆那天下午是否看起来比霍金斯夫妇更加容光焕发，那时他俩首次成双成地出。

To find out, researchers had participants pair off and walk together, either in synch or just at their natural pace.

为了一探究竟，研究人员让参与者们成双结并且一起行走，要么同步，要么随性。

This month, a lot of Americans are talking about pairs or doubles – words relating to the number two.

这个月，很多美国人都谈论成双（pairs）成（doubles）——与数字2有关的单词。

They walked or danced around a cake in pairs, and the best couple won the cake.

他们成双结地围着蛋糕走或者跳舞，跳的最棒的一赢得蛋糕奖励。

When your wife dies, it must be depressing to see other people in a loving relationship.

谁的妻死了 看见成双成的幸福 心里都会不舒服的。

They were doing it in pairs, couples.

他们成双成地做着。

Stupid things have good outcomes all the time.

- 傻事好事成双。

We'll see couples rowing in row boats and paddling in paddle boats.

我们会看到成双成的人划船和划桨。

People just walking around late at night, some were alone while others were in pairs.

人们深夜漫步，有的独行，有的成双。