例句與造句

1. Pollen analysis a means of obtaining information on the composition and extent of past floras and environments by examining fossil pollen grains , spores , and similar structures in peat and sedimentary deposits
   花粉分析：指通過檢測花粉化石、孢子以及在泥炭和沉積物中類似的結(jié)構(gòu)，以獲得歷史上曾有過的植物區(qū)系、組分以及分布范圍與環(huán)境信息的方法。
2. It's difficult to find fossil pollen grain in a sentence. 用fossil pollen grain造句挺難的