ecotourism

生态旅游

【例】Many provinces in China have started to develop ecotourism to boost the local economy.

中国的许多省份已经开始发展生态旅游来振兴当地经济。

edge

边缘；刀刃；优势；侧着移动；徐徐移动

【例】The national economy is almost stagnant and on the edge of collapse because of long-term and large-scale strike.

由于长期大规模罢工，国民经济几乎停滞，濒临崩溃。

effective

有效的；给人印象深刻的；实际的

【例】The contract became effective as of the date of December 20^th, 2012.

本合同从2012年12月20日起生效。

efficiency

效率，效能；功效

【例】Regular maintenance is helpful for improving the efficiency of the engine and extending its service life.

定期保养有助于改善发动机性能，延长其使用寿命。

elasticity

弹性；弹力；灵活性

【例】Elasticity of demand refers to the responsiveness of change in quantity demanded of a commodity or service as a result of change in its prices.

需求弹性指商品或服务的需求量变化相对该商品或服务的价格变化的反应程度。