秘诀31 “清”与“浊”间的同化
当north，south，worth这三个词变为形容词worthy时，这些词原来词尾的[]因为受了后面元音的影响，就变为了浊音[]：
north [] northern []
south [] southern []
worth [] worthy []
1．She has traveled in northern countries. 她曾游历过北方诸国。
2．The southern half of the country is a desert. 这个国家的南半部是沙漠。
3．She says she helps only the worthy poor. 她说她只帮助那些值得她去帮助的穷人。
【不包括那些她认为好吃懒做等不配取得帮助的人】
4．This book is worthy of being read [to be read]. 这本书值得一读。