您要查找的是不是：
- The two systems of government are polar opposites. 这两种政体正好相反。
- The stethoscope is a medical instrument. 听诊器是一种医疗器械。
- Most insect do not live in polar region. 大多数的昆虫不在极地地区生存。
- This instrument monitors the patient's heartbeats. 这台仪器监听病人的心跳。
- Are there any animals in the polar circles? 南极圈和北极圈内有动物存在吗？
- The king signed the instrument of abdication. 国王签署了逊位的文告。
- 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
- A similar board used as a percussion instrument. 敲击板用作打击乐器的一种类似的板
- This scientific instrument suffered severely. 这部科学仪器受到严重损坏。
- Language is an instrument for communication. 语言是交际的手段。
- 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。
- The compass is an instrument of navigation. 罗盘是航行仪器。
- The bagpipe is a sweet musical instrument. 风笛是一种听起来很悦耳的乐器。
- The viola is a stringed instrument. 中提琴是一种弦乐器。
- The polar region is the habitat of the polar bear. 北极地带为北极熊的栖息地。
- A telegraphic sending instrument. 发报器电报机中发射信号的仪器
- Although they can swim, the polar bears are terrestrial animals. 北极熊虽然会游泳，但也是陆栖动物。
- Made with or as if with a sharp instrument. 割开的用或好象用利器制成的
- In spite of vigilance a polar bear escaped from the zoo. 尽管警戒很严，北极熊还是逃出了动物园。
- An instrument for recording muscular contractions. 肌动描记器记录肌肉收缩的器械
