In solving rational inequalities, using the number line yields a higher correctness rate than using algebraic manipulations.
解答分式不等式，选用数轴标根法比代数方法有更高的正确率。
While most of the students use algebraic manipulations, some adopted the method of using the number line, and still some few solve by sketching the graphs.
解答二次不等式，选用代数方法比数轴标根法有更高的正确率；
We can also replace the text in the buffer at a given line number or remove the first occurrence of a string in the current line, using this utility.
我们还可以使用该命令替换给定行号的缓冲区中的文本，或者删除当前行中第一个出现的字符串。
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