key drop meaning in English

盖孔板
钥匙孔盖片

As he was reading , a car key dropped from the back of the bible
读着读着一把车钥匙无意间从圣经背面滑落出来。
Deadlock after a computer by the reopening of key drops trickling hosts . . by calling incessantly ? ?
电脑死机后一按重启键主机就滴滴滴. .的叫个不停? ?
Dialog box , in the primary key drop - down list , choose the table that will be on the primary - key side of the relationship
在“表和列”对话框中，从“主键”下拉列表中选择要位于关系主键方的表。