数值计算

For example, the merger of ancient voiced obstruent onset tone IV syllables into IB covers the whole Mandarin area except for Jiangsu and Anhui which preserve tone IV, and the merger of sonorant onset tone IV syllables into III covers the Mandarin areas of Hebei-Shandong, Lanyin, Beijing, the Northeast, Liaoning, etc., and the merger of voiceless onsets into IA covers the Mandarin areas of the central plains and Hebei-Shandong.

例如，古全浊声母入声字归阳平的读法涵盖了除保留入声的江淮官话以外的所有官话区，古次浊声母入声字归去声的读法涵盖了冀鲁、兰银、北京、东北、胶辽等五个官话区，古清声母归阴平的读法也涵盖了中原官话和冀鲁官话。

Everyone in any office uses it, everyone needs it, and almost everyone gets annoyed with it regularly – have you guessed yet that I am talking about the copy machine?

有一样东西，办公室里人人要用它，却几乎人人烦它，你猜到我说的是什么了吧？对，就是复印机。