lengthening

名词 lengthening:

1. the act of prolonging something
   同义词：prolongation, protraction, perpetuation

动词 lengthen:

1. make longer
   同义词：lengthen
2. become long or longer
   同义词：lengthen

1. He lengthened the rope by tying another piece to it.
   他又接上一段绳子，把原来的加长了。
2. The irregular lengthening of a normally short syllable.
   一个正常情况下短音节的不规则的延长