The flower structure in one tree was different, enforcing cleistogamy.同一株树上的花结构不同, 因而闭花受精是强制实现的.This trait is called cleistogamy and occurs naturally in some plants.这种特性称为闭花受精;一些植物会自然发生闭花受精....
他在全国四处游说，号召人们共赴大业。He barnstormed across the nation, rallying the people to the cause.他将形势描述得非常危险，并号召采取果断行动。He described the situation as very dangerous and called for resolute action.古尔德先生号召采取“一人一票制”。Mr Gould called for ...