walk-up

n.

无电梯的公寓；

adj.

无电梯的；（服务设施等）临街的；

复数：walk-ups

1. The empty space on the street left by the demolished house is half-filled by a fence of rotten boards, shored up by five stone posts.
   那房屋被毁以后，留下一块临街的空地，空地的一半由一道有五根条石支撑着的栅栏围着，栅栏上的木板已经腐朽。

Selective 6-acylation of sucrose mediated by cyclic adducts of dialkyltin oxides and diols
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