renewable 

1.On the tiny blue planet we see from space, the light side of the force is clean, green and renewable.

2.We have massive renewable energy potential but we use only a fraction（部分） of it. 

greenhouse   

1.Our greenhouse is nothing compared with yours.

2.They are greenhouse gases.

Fahrenheit  

1.He was asked for the boiling point of water in Fahrenheit.

2.So this is how to get Celsius（摄氏度） from Fahrenheit.

fossil   

1.At this distance of time it is difficult to date the fossil. 

2.A fossil is the hard remains of a prehistoric animal or plant that are found inside a rock. 

byproduct   

1.Sugar and its byproduct are the basis of the island's economy. 

2.It is a byproduct of great, simple living.

measurement   

1.We took lots of measurements.

2.Tests include measurement of height, weight, and blood pressure.

drought   

1.The crops died during the drought.

2.We had to replant after the drought.

famine   

1.War brings death and famine. 

2.Thousands died of famine. 

environmental    

1.It protects against environmental hazards such as wind and sun.

2.They are trying to widen the discussion to include environmental issues.

environmentalist   

1.He is an environmentalist.

2.An environmentalist is a person who is concerned with protecting and preserving the natural environment.

economical    

1.I want most economical packing. 

2.The government should take effective measures to live through this economical crisis. (危机)

hectare   

1.A hectare is is equal to 10,000 square metres.

2.A hectare is equal to 15 mu.

individual   

1.After all， individual strength is limited. 

2.The interests of the collective lie before the interests of the individual. 

appliance   

1.He could also learn to use the washing machine and other household appliances.

2.There is no special packaging of these files for the appliance.

imperative   

1.It was imperative that he act as naturally as possible.

2. He always speaks in an imperative tone of voice.

heading   

1.A heading is the title of a piece of writing

2. I'd like the heading to be in a different typeface from the text.

slogan    

1.Such a slogan will bind our hand and foot. 

2.'service with a smile " is the store's slogan.