定义域、间断点、或与且等问题是初等函数经常遇到的问题。
The problems of definition domain, break point, or and even etc often occur in elementary function.
委托对象或者说委托方法是一个简单且功能强大的模式，在此模式中，程序中的一个对象，其行为代表另一对象，或与其一致。
A delegate object or delegation is a simple and powerful pattern in which one object in a program ACTS on behalf of, or in coordination with, another object.
结果表明：供试的仙人球在水培中均能正常生长，且生长速度显著大于基质培或与之相当；
The results showed that both of the tested ball cactuses varieties could grow well in hydroponics, in which the growth rate was significantly higher than or equal to that in medium culture.
结果表明：供试的仙人球在水培中均能正常生长，且生长速度显著大于基质培或与之相当；
The results showed that both of the tested ball cactuses varieties could grow well in hydroponics, in which the growth rate was significantly higher than or equal to that in medium culture.
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