键盘字符 英文 ` backquote ~ tilde ! exclam @ at # numbersign $ dollar % percent ^ caret & ampersand * asterisk ( parenleft ) parenright - minus _ underscore = equal + plus [ bracketleft { braceleft ] bracketright } braceright ; semicolon : colon ' quote " doublequote backslash | bar , comma < less . period > greater / slash ? question space