standard的`例句：
Who sets the standard for water quality?
水质标准由谁来制订？
The general standard of racing was abysmal.
比赛的总体水平糟透了。
A standard letter was sent to all candidates.
给所有求职者均寄去了一封标准函。
Her latest book isn't up to her usual standard.
她的`新作没有达到她平常的水准。
By day he worked downtown for American Standard.
白天，他在市中心为美国标准公司工作。
