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| 舞台等的地板门; 房顶的活动天窗 | |||
| 活板提升，升降门 | |||
| 检査孔; 人孔 | |||
| 陷门; 活门 | |||
| 翻板 | |||
| 陷阱门; 天窗 (用于软件) | |||
| 活板门 | |||
| 通气门; 上翻门; 落板装置; 落板口; 调节风门; 天窗; 水平翻门; 底板孔口盖; 仓门; 活盖门; 屋顶的活动天窗 | |||
| 活动天窗; 密码通道 | |||
| English thesaurus | |||
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| Unauthorized electronic exit, or doorway, out of an authorized computer program into a set of malicious instructions or programs | |||
| trap door: 17 phrases in 4 subjects |
| Oil / petroleum | 7 |
| Rail transport | 5 |
| Surgery | 2 |
| Technology | 3 |