drop-in

n.

不速之客；偶尔的来访；旁听生；吸毒者的巢穴

adj.

可随时造访的；无须预约的 ；免费提供信息和帮助的；

1. Some of the people were drop-ins who had no real interest in the case.
   有些人是顺便来听听的，对这个案子并无真正的兴趣。

Low-temperature-cofired-ceramic (LTCC) tape structures including cofired ferromagnetic elements, drop-in components and multi-layer ...
Enhanced drop-in syndromic surveillance in New York City following September 11, 2001.
Spaces of care in the city: the place of a community drop-in centre
Experimental analysis of a new refrigerant mixture as drop-in replacement for CFC12 and HFC134a
Substance abuse and personality disorders in homeless drop-in center clients: symptom severity and psychotherapy retention in a rand...
Effectiveness of an ambulatory care telephone service in reducing drop-in visits and improving satisfaction with care.
Performance assessment of HC-290 as a drop-in substitute to HCFC-22 in a window air conditioner
Experimental analysis of R1234yf as a drop-in replacement for R134a in a vapor compression system
Das, D. et al. Enhanced drop-in syndromic surveillance in New York City following September 11, 2001. J. Urban Health 80, i76−i88
Consumer-operated drop-in centers: Evaluation of operations and impact