The seeds and pollen, or the lack of them, can show severe weather changes over thousands of years.

VOA: special.2010.04.07

The one theory made some investigations of earth spores, hoping to find-- what do you call that stuff that floats around and makes you sneeze? Pollen.

有种学说对于,土地孢子进行了调查,期待发现,通过植物种子的变化推定气候状况的方法

耶鲁公开课 - 古希腊历史简介课程节选

Some the more common allergens include animal fur,dust, mold and pollen.

VOA: special.2009.07.28

It serves as a landing area for bees and other insects that spread pollen to the plant.

VOA: special.2010.04.06

For example, try to avoid animals with fur,dust, pollen from trees and flowers or cigarette smoke.

VOA: special.2009.07.28

Pollen is a fine dust that comes from grass, trees and flowers.

VOA: special.2009.07.28

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

VOA: special.2010.12.21