例句與造句

1. But seed orchards are difficult to control , because tree pollen spreads so far that alien , non - elite trees almost inevitably muddy the gene pool
   但是有種子的果樹很難控制，因為花粉傳播的太遠了，一些其它種類的樹木就會不可避免地弄亂此基因庫。
2. Surface - enhanced raman spectra are presented for tree pollen ( cottonwood and redwood pollen ) and a bacterium ( escherichia coli ) , and the e . coli spectra are compared with results obtained from the literature and with results obtained previously by mixing various concentrations of the bioanalyte with the silver colloid
   增加表面積后之拉曼光譜發(fā)現(xiàn)于樹花粉(棉白楊及紅杉)及一種細菌(大腸桿菌) ，將大腸桿菌之光譜與文獻中及一系列混和濃度之光譜進行比較。
3. It's difficult to find tree pollen in a sentence. 用tree pollen造句挺難的