The most common cause is pollen from flowering plants and trees.

VOA: special.2010.12.21

There were also issues about nutritional adequacy and meat turned out to be a better overall food than most plants.

还有关于营养充分的问题,这样看,肉类较植物来说是更好的食物

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Scientists think most Galapagos plants and animals floated to the islands.

VOA: special.2009.12.16

But even plants that grow in most deserts have trouble surviving.

VOA: special.2010.01.04

It is also the color of most growing plants.

VOA: special.2010.05.23

Most kinds of rose plants come from Asia.

VOA: special.2010.06.15

In an extraordinary move that sent Toyota stock prices plummeting, the world's largest automaker has suspended sales of eight of its most popular models and shut down five North American plants.

VOA: standard.2010.01.28