lengthen

动词 lengthen:

1. make longer
2. become long or longer

1. Could you lengthen your speech out by adding some examples?
   你不可以增加些例子，把发言拉长一些吗？
2. The days started to lengthen in March.
   白昼在三月里开始变长。
3. 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。

length.en

v.tr.intr.（及物动词和不及物动词）
length.ened,length.en.ing,length.ens
To make or become longer.
使延长，使变长：使更长或变得更长

【引伸】
length.ener
n.（名词）