grass-roots work的用法和样例：
例句
- Only by carrying out the grass-roots and day-to-day work can we hopefully implement all of our slogans and principles.
至于提这样口号，那样口号，这样方针，那样方针，只有有了基层工作，有了经常工作，才有希望落实。 - That is indeed much of what goes on, but in the following chapter you'll learn how to do the detailed low-level work by making decisions within a method.
这种说法大体正确，但通过以后的学习，大家还会知道如何在一个方法里作出决策，做一些更细致的基层工作。
