ph.
1. The river has narrowed down over the past 20 years.
这条河在过去的二十年变窄了许多。
2. Their demands had narrowed down to only two points.
他们的要求已减少到只有两点。
1.
1. 缩小范围：但是这帮鸟人不是盖的,他们知道如何缩小范围(narrow down)去找到那种肽. (后面还出了一道选择题我选的是know exactly what to find. i am 100 percent sure.)好了,他们开始试验神经系统的肽(neuropeptide)并发现此酶对人体中的神经肽破坏速度甚快.
2.
2. 缩小或限制范围(使更确切)：much less更不用说;更少;不及 | narrow down缩小或限制范围(使更确切) | not to mention更别提...,更不必说...
3. narrow down
3. 变窄：narrow capillary segment 毛细管颈 | narrow down 变窄 | narrow examination 严格的检查
4. 911查询·英语单词
4. 缩小：6. require that sb. (should) do sth. 要求某人应该做某事 | 7. narrow down 缩小 | 8. have no skill at doing 不具备什么的技能
verb
1. become more focus on an area of activity or field of study
e.g. She specializes in Near Eastern history
Synonym: specializespecialisenarrow
2. define clearly
e.g. I cannot narrow down the rules for this game