英语语法分析

During the drawdown period, the vegetation is structured by helophytes and emergents.

在水位下降期间，植被主要由沼生植物和挺水植物组成。

That's why Obama can meet the troop drawdown deadline.

所以奥巴马能够履行撤军的期限承诺。

Then it is necessary to factor in the effect of delayed drawdown of committed funds.

这样，就有必要计入推迟撤走承诺资金的影响。