9 see joke: The person was swarmed in opern, there are a lot of geminate and didymous lovers in the audience.

歌剧院中挤满了人，观众中有许多成双成对的情人。

By controlling reaction condition in different steps and hydrogenated with Raney Ni,most of components were converted into industrial grade p-menthane without purification.

实施分阶段控制反应条件，用雷尼镍，多数组分均加氢成对孟烷，无需提纯，即达到工业级的要求。

The key reason for the improved performance are the pairs of counterrotating swirls created at either side of the leading-edge bumps, called tubercles.

隆起前缘能增进性能的键理由，是因为在这些隆起节瘤的两侧，会产生成对的反向旋转涡流。

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.

都市中心的公寓吹一种以游泳池和夜总会为核心的生涯方式，这种方式的特性为夜夜鸡尾酒会，并想象应入睡时，人们成双成对地离去。