V-T/V-I When something lengthens or when you lengthen it, it increases in length. 使变长; 变长
The evening shadows were lengthening.
傍晚的影子正在变长。
V-T/V-I When something lengthens or when you lengthen it, it lasts for a longer time than it did previously. 使延长; 延长
Vacations have lengthened and the work week has shortened.
假期延长了，工作周变短了。
It used to be three kilometres but most people wanted to do a bit more than that so we lengthened it to five kilometres—we now go round the lake twice and that adds an extra two kilometres.
以前是3公里，但大多数人想多逛一下，所以我们把路程延长到5公里——现在我们绕湖两圈，这就比以前增加了2公里。
The afternoon shadows lengthened.
下午影子渐渐变长了。
The shadows lengthened as the sun went down.
随着太阳西下，影子越拉越长。
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