They say he often asked why some plants grew better in different areas of the farm.

VOA: special.2009.11.10

So economically it meant more-- it made more sense to eat meat under those circumstances, but of course the meat didn't exist in all places of the world, so some people were dependent on plants.

因此,从经济角度看,在那样的环境中,食肉更加合理,当然肉类并不是世界各地到处都有,因此,有些人们就依赖于农作物

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

and ideally at some point coal, coal-fire power plants.

理想情况下，在某个时间点可能还会关闭煤炭以及燃煤电厂。

全球变暖与国力 - SpeakingMax英语口语达人

Some plants' pores can tighten to save water during conditions of high carbon dioxide.

VOA: special.2010.01.26

For example,some plants grow taller and their roots grow deeper into the sand.

VOA: special.2010.01.04

So here we go. Some plants are annuals.

VOA: special.2009.07.21

Still,some plants do absorb more than others.

VOA: special.2009.06.09

Some helped to rid the city of troublesome invasive plants, or cared for trees at city parks and schools.

VOA: special.2009.09.04

He said the darkening of the Martian surface during some times of the year was caused by the growth of plants.

VOA: special.2010.07.11

Experts are trying to learn how to grow and protect some of the very unusual plants that live in Haleakala.

VOA: special.2010.09.08

Also,there are concerns that some organisms could begin to resist the plants designed to resist them.

VOA: special.2009.10.27

In fact,some of the nicest looking plants in the world are best enjoyed from a distance.

VOA: special.2009.08.25

We are going to explain some commonly used terms for plants and farm animals.

VOA: special.2009.07.21

Snowfall helps to protect plants and some wild animals from cold, winter weather.

VOA: special.2010.01.05

Many visitors to the exhibit say they recognize some common orchid plants.

VOA: special.2010.04.06

Some people like to harvest the plants when the chilies are green.

VOA: special.2009.04.21

Snowfall helps to protect plants and some wild animals from winter weather.

VOA: special.2011.01.11

Some of the plants are found above the Arctic Circle.

VOA: special.2010.04.06

Genes exist in plants,animals, human beings and even some viruses.

VOA: special.2010.03.23

That disease can infect potatoes, tomatoes and some other plants.

VOA: special.2009.10.20

Some unwanted plants provide food for pollinators like bees.

VOA: special.2011.05.24

Some dinosaurs ate meat and some ate only plants.

VOA: special.2010.06.04

Some are "air plants" that grow on trees.

VOA: special.2010.04.06

Some animals and plants had disappeared.

VOA: special.2009.12.16