马的黑色与棕色是一对相对性状，现有黑色马与棕色马交配的不同组合及结果如下：

①黑×棕→1匹黑  ②黑×黑→2匹黑  ③棕×棕→3匹棕   ④黑×棕→1匹黑+1匹棕

根据上面的结果，下列说法正确的是（　　）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词；

删除：把多余的词用斜线（＼）划掉；

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Yesterday afternoon, our school held on a fire drill. We were listening the teacher carefully in the English class when we heard the fire alarm. The teacher told us to calm down and instruct us to leave a classroom in order immediately. When we got into the passage, we found they were surrounded by smoke. It was becoming difficult to breathe but to find tine way out. Finally, with our mouths covering with wet towels, we bent down and got out of the teaching building so quickly as possible. Through the fire drill I now realize what dangerous it is when there is a fire and that we should know how to escape from a fire on case of emergency.

“亲切的手牵引着走上令人耳目一新的通幽曲径”这句话的含义是____。