环环相扣 | huán huán xiāng kòu | closely linked with one another / interlocked / to interrelate | |
连环计 | lián huán jì | interlocked stratagems / CL:條|条[tiao2] | |
九连环 | jiǔ lián huán | Chinese rings, a brainteaser toy consisting of nine rings interlocked on a looped handle, the objective being to remove the rings from the handle |