1.Vocabulary is one of the important parts of a language and it plays an essential role in verbal communication and language instruction.
词汇是语言的重要组成部分，它在语言交流与教学中起着不可或缺的作用。
2.Mrs. Roosevelt assumed this essential role, which she said was like being his "eyes and ears. "
罗斯福夫人代替他从事这项重要工作——用她的话说，充当丈夫的“眼睛和耳朵”。
3.IVF has played an essential role in Denmark in terms of keeping up the number of population.
玻璃体受精为帮助丹麦保证人口数量起到了重要的作用。
4.So the friction plays an essential role for us to get static equilibrium, and that is often the case.
摩擦力在达到静力，平衡中起了很大作用，情况就是这样。
5.An essential role of the welding engineer is to ensure that the design offered to him does not present insurmountable problems to execute.
焊接工程师的主要职责是确保所提供给他的设计并未带来无法解决的问题。
6.There are vivid account of dreams in Dreams of the Red Mansion and Wuthering Heights, which play a very essential role in those two novels.
《红楼梦》与《呼啸山庄》这两部小说中都存在梦境的描写，梦境在两部小说中起着非常大的作用。
7.In fact, the inquiry commission may have already played an essential role in beginning to bring fraudsters to justice.
事实上，调查委员会可能已经在对金融危机中的不发分子绳之以法的过程中发挥了重要作用。
8.The balise plays the very essential role in guaranteeing the high speed movement of the train and safety.
应答器在列车高速运行、保证行车安全等方面起到了非常关键的作用。
9.I think the critics of an activist fiscal policy are forgetting the essential role of monetary policy as it relates to fiscal policy.
我认为对积极的财政政策的批评似乎忘了相关货币政策重要作用。
10.Thus, angiogenesis plays an essential role in tumor growth and metastasis and is a promising therapeutic target for cancer treatment.
因此血管的生成在肿瘤的成长转移当众起了一个很重要的角色，也是肿瘤研究的治疗靶点。