Hcb
abbr. hard-covered book 精装书; hard-core base 核心基地; hollow concrete block(s) 空心水泥砖; heating and cooling of buildings 建筑物的保暖和降温
🗣️ 情景例句
Different kinds of activities, such as commenmorative meetings, planting trees,
举行各种各样的活动，例如召开纪念大会，植树造林，
We couldn't help the accident.
我们未能防止事故发生。
Very interesting.
很有意思。