Don 't use spaces or other strange punctuation characters .
为了免却从安卓的字母键盘切换到数字与符号键盘的麻烦，按下点号键便可看见常用的标点与其他符号。
To avoid switching from Android 's letter keyboard to its number and symbol keyboard , hold down the period key to see commonly used punctuation marks and symbols .
常用标点符号