1. wildcard characters ,通配符，表示*,?，[]等
The wildcard characters in make are ‘*’, ‘?’ and ‘[...]’
2.slash,反斜杠
The character ‘~’ at the beginning of a file name also has special significance. If alone,
or followed by a slash, it represents your home directory.
The slash (punctuation) or solidus is the "/" punctuation character.
3、asterisk，星号
Thus, ‘foo\*bar’ would refer to a specific file whose name consists of ‘foo’, an
asterisk, and ‘bar’.
4. recipe 菜谱，命令包
The recipe of a rule consists of one or more shell command lines to be executed, one at a
time, in the order they appear.