The "CD" commands explicitly put us in the right place, and prevent us from making a mistake later — an important step — especially if you will be deleting files inside the functions.
cd “命令显式地使我们处于正确的位置，并防止以后出现错误-这是重要的步骤，特别是在函数中删除文件时更是如此。”
2
But he was nice and told us he would stay and sign the CD for everyone.
但是他人很好地告诉我们说他会留下，为每个人签名。
3
Another few leaps have brought us to where we are now: an age where it only takes minutes to burn a CD.