New words：

rapid [ˈræpɪd] adj.瞬间的；短时间内发生的；迅速的；快速的
rapidly ['ræpɪdli] adv.迅速；高速；急速地；急促

Sample Sentences：

The cells began to divide rapidly.
The disease is spreading at a rapid rate.
He has made rapid progress in his studies.

progress [prəˈɡres] n.进展；进步；进程；前进

New words：

sacrifice [ˈsækrɪˌfaɪs]
v.牺牲；献出；
n.牺牲；祭祀；祭品；祭献

Sample Sentences：

Thank you guys for you all sacrifice.
She sacrificed everything for her children.
He was willing to make any sacrifice for peace.
Her parents made sacrifices so that she could have a good education.

New words：

promotion [prəˈmoʊʃ(ə)n] n.促进；提升；推广；晋升

Sample Sentences：

Why are you so jealous of David's promotion?
I will get a promotion and earn a lot of money.
She got a promotion after working hard for three years as a manager.

New words：

promote [prəˈmoʊt] v.促进；推动；提升；提拔；晋升

Sample Sentences：

She worked hard and was soon promoted.
The area is being promoted as a tourist destination.
You don't have to sacrifice environmental protection to promote economic growth.

sacrifice [ˈsækrɪˌfaɪs] v.牺牲；献出；

New words：

hybrid [ˈhaɪbrɪd]
n.杂种；杂种动物；杂交植物；（不同事物的）混合物
adj.杂种的；混合的；混合语的

Sample Sentences：

Yuan is known as the Father of Hybrid Rice.
Hybrid rice is a stronger plant, unlike ordinary rice.
A mule is a hybrid of a male donkey and a female horse.
Hybrid cars are powered by two engines: one petrol, one electric.