?关健

... collude with]∶勾结;有某种关系 reality]∶真实情况 the ins and outs(of a matter);key]∶底细;关健 ...

?详情

... be in for 注定要遭受 the ins and outs 详情，来龙去脉 by inches 逐渐地，勉强地 ...

?关键

... collude with ∶勾结;有某种关系 reality ∶真实情况 the ins and outs(of a matter);key ∶底细;关键 ...

?底细

... [ after all ] 究竟 [ the ins and outs ] 底细 缘由 详情 [ extreme point ] 线段或射线的起点或终点 ...