rig作为词根的意思是严格的，如rigorous
例句
1、
Guests without invitations have to undergo rigorous safety checks.
没有邀请函的客人要接受严格的安全检查。
2、
Was it a curriculum that appeared more rigorous， perhaps?
或许是一门看似更为严格的课程?
3、
The work failed to meet their rigorous standards.
工作没有达到他们的严格标准。
词根词缀:rigi-， rig-:【来源及含义】Latin: stiff， hard， numb to be frozen， to grow stiff with
