您要查找的是不是：
- Polar head group to join the first rule is spacer group linking the two hydrophobic chains, then two polar heads Chiga up, usually ethylene oxide or propylene oxide to join method. 极性头基加入法则是联接基团先连接两条疏水链，再把两个极性头基加上去，一般是环氧乙烷或者是环氧丙烷加入的方法。
- The two systems of government are polar opposites. 这两种政体正好相反。
- She nestled her head on his shoulder. 她将头依偎在他的肩上。
- Most insect do not live in polar region. 大多数的昆虫不在极地地区生存。
- The deer lowered its head to drink from the pond. 鹿低下头去喝池塘里的水。
- He gave the little boy a clout on the head. 他在那小男孩的头部打了一下。
- I saw the small girl topple over and hit her head. 我看见那小女孩栽了一跤，碰着了头。
- I was dazed by the blow on my head. 我的头挨了一击而觉得晕眩。
- Are there any animals in the polar circles? 南极圈和北极圈内有动物存在吗？
- She leaned her head back and whispered the news. 她向后仰着头，小声说出了这个消息。
- The horse kicked its fallen rider about the head. 那匹马乱踢从它背上掉下来的骑手的头部。
- A price of $1000 was set on the jewel thief's head. 悬赏1000美元抓住这个珠宝窃贼。
- As I was waiting for a bus a brick fell on my head. 当我在等公共汽车时，一块砖头落到了我的头上。
- Located or found in one of the Polar Regions. 环极的，围绕极地的位于或发现于一个极地区域中的
- He because of bashful but low head. 他因羞愧而低下了头。
- She greeted us with a nod of the head. 她向我们点点头打招呼。
- He was sitting with his head buried in a book. 他坐着埋头看书。
- He batted the idea around in his head. 他脑子里反复思考这个想法。
- In spite of vigilance a polar bear escape from the zoo. 尽管警戒很严，北极熊还是逃出了动物园。
- How can I enlighten your wooden head? 我怎么才能让你这木头疙瘩开窍呢？
