成双的

Apartment complexes in urban centers advertised a lifestyle organized around the swimming pool and clubroom featuring nightly cocktail parties and the imagination that everyone paired off by bedtime.

都市中心的公寓大楼宣扬一种以游泳池和夜总会为核心的生活方式，这种方式的特点为夜夜鸡尾酒会，并想象应入睡时，人们成双成对地离去。

Apartment complexes in urban centers advertised a lifestyle organized Speaker around the swimming pool and clubroom featuring nightly cocktail parties and the imagination that everyone paired off by bedtime.

都市中心的公寓大楼宣扬一种以游泳池和夜总会为核心的生活方式，这种方式的特点为夜夜鸡尾酒会，并想象应入睡时，人们成双成对地离去。

According to the direct ratio relationship in a certain range between the color degree of the organic solvent with Pb^2＋ and dithizone in the complex compound and the amount of the lead, the amount of the lead can be rapidly determined by way of the visual colorimetry.

再加入双硫腙的三氯甲烷溶液，根据Pb^2＋离子与双硫腙生成的配合物在有机溶剂中的颜色深浅与铅含量在一定范围内成正比的关系，用目视比色法即可快速判断出样品中的铅含量。

After the sample is dissolved and the disturbance eliminated, then dithizone and chloroform solution are added in the sample. According to the direct ratio relationship in a certain range between the color degree of the organic solvent with Pb2+ and dithizone in the complex compound and the amount of the lead, the amount of the lead can be rapidly determined by way of the visual colorimetric.

样品消解并消除干扰离子后，加入双硫腙的三氯甲烷溶液，根据铅与双硫腙生成的络合物在有机溶剂中的颜色深浅与铅含量在一定范围内成正比的关系，用目视比色法即可快速判断出样品中的铅含量。

A person's lungs are duplicate, but he has only one heart.

一个人的肺是成双成对的，但他只有一个心脏。

The influence of microwave radiation on Ullmann reaction has been investigated by three Ullmann reactions, including triphenylamine formed by treating the diphenylamine with bromobenzene or Chlorobenzene which substitutes Iodobenzene; 4,4\'-dimethyltriphenylamine formed by treating 4,4\'-dimethyldiphenylamine with bromobenzene which substitutes Iodobenzene; 4,4\',4-trinitrotriphenylamine formed by treating 4-chloronitrobenzene with p-nitroaniline in this paper.

实验表明，在微波辐射条件下，顺式比反式迈克尔反应活性高；若在丁烯二酸的双键上引入甲基后，降低了进行迈克尔加成反应的活性；引入酯基对双键的影响比腈基有利于进行迈克尔反应，丙烯酸甲酯较丙烯腈的迈克尔反应活性高。

A composed rhomboid prism composed of two isotropic left-handed material prisms with an uniaxially anisotropic LHM plate,there is an angle between the interface of which and the optical axis, was designed.

左手材料复合双棱镜内部界面的古斯-汉森位移，设计了一种左手材料复合双棱镜，由两块各向同性左手材料棱镜与夹在其间的、其界面与光轴成一定的角度的单轴各向异性左手材料平板构成。

A mated pair of red-and-green macaws soars above the forest in Bolivia's Madidi National Park.

成双成对的红-绿色金刚鹦鹉往上高飞在玻利维亚的麦迪迪国有森林公园之上。

On the shingle, ringed plovers, looking too sweet to live in the real world, surveyed their bleak domain two by two, a forbidding place where, astonishingly, they will nest.

在沙滩上，可爱得好像不该生活在现实生活中的剑鸻开始成双成对地巡视着它们荒凉的领地。

Six penguins at Bremerhaven Zoo in north-west Germany provoked excitement across the world when, in the absence of any females, they were discovered wandering around in pairs, trying to mate with each other and sitting on stones as if they were eggs.

德国西北部布莱梅动物园的六只企鹅在没有任何母企鹅的情况下，被人发现成双成对地四处徘徊，彼此试图交配，并把石头当成蛋坐在上头，引起全世界骚动。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。