及物动词

不及物动词

1. （使）加长；（使）伸长
When something lengthens or when you lengthen it, it increases in length.

2. （使）（时间）延长；（使…）持续更长时间
When something lengthens or when you lengthen it, it lasts for a longer time than it did previously.

1. become long or longer

e.g. In Spring, the days lengthen

2. make longer

e.g. Lengthen this skirt, please