standing room

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His talks on game design are standing room only.
当他开始进行关于游戏程序设计的演讲时，会议大厅的空位上都会站满人。
There was standing room only at the sale in May this year.
今年5月的拍卖会，[人多得]只能站着。
If the pool is standing room only on a hot day, reconsider getting in, since your risk of getting sick will be higher.
如果天气炎热的时候池里只有站的空间了，那么请你进去前再考虑一下，因为这个时候感染的风险更高了。

Those potholes were making areas unsafe, so Sunday night organizers canceled 8,000 standing room general admission tickets for Monday's and Tuesday's Snowboard Cross events.
It probably would not have been as enjoyable today." Wilkinshaw added that he has only general admission standing room tickets for Wednesday's snowboard halfpipe event at Cypress Mountain, so he knows it's possible those tickets could be canceled.
The painting hangs in a circular room and completely surrounds visitors standing in the middle of the space.

At the hearing, the spectator gallery was standing room only, but Specter and fellow committee member Sen.
FORBES: Hedge Hogs

space in a sports ground, theatre, bus, etc. where people can stand, especially if all of the seats have people sitting in them

Standing room is space in a room or bus, where people can stand when all the seats have been occupied.