开展的英文：
develop
unfold
start
launch
open

参考例句：

To conduct dialogue and hold negotiations on peaceful reunification has been our consistent position.
开展对话,进行和平统一谈判,是我们的一贯主张。

Protecting natural forest resources, carrying out afforestation and improving the ecological environment
保护天然林资源，开展植树造林，改善生态环境。

The Chinese government has done its utmost to enthusiastically help bordering countries to unfold anti-drug combat.
中国政府尽自己的力量，积极帮助周边国家开展禁毒工作。

but also the prerequisite for a teacher to obtain satisfactory result in quality-oriented education.
而且是教师更好地开展素质教育,取得良好效果的必要条件。

A drive for cost reduction is announced.
宣布开展降低成本的竞赛。

They launched a movement for increasing production and practicing economy.
他们开展了增产节约运动。

"The fight against pornography, illegal publications and piracy shall be continued."
继续开展"扫黄打非"斗争

Launch a nationwide physical fitness campaign; carry out physical fitness programmes involving all our people
开展全民健身运动

Establish horizontal economic relations with ...
与..开展横向经济联系

Launch a mass production movement
开展群众性生产运动

develop是什么意思：
v. 使发展，成长；详尽阐述；展开；开发；逐渐产生；逐渐养成；进步，进化

development parameter
发展参数；发展规范

development of gas
放出气体；放出毒气

Coordinate economic development with social development
把经济发展和社会发展结合起来

unfold是什么意思：
v. 展开；开展，发展显露；显露

This is the process of budding and unfolding of blossoms.
这是花朵萌芽并绽放的过程。

His talents have unfolded since then.
他的才华开始显现。

As the story,scene, enquiry unfolds(itself)
如故事、场景、调查所显示的那样

start是什么意思：
n. 开始，起点；动身；开动；震惊，震动
v. 出发；开始，着手；发动；创办；惊起

Then It'started to break into pieces. These pieces started to move apart.
然后它开始分为很多块。这些分开的板块开始移动，分开。

He started coughing blood.
他开始咳血了。

His hearing has started to go.
他的听力开始衰退。