1(zoology) segment (of the body of a worm, centipede etc)
2(fig.) a part of an integrated whole: aspect (of a project), element (of a policy), sector (of the economy), stage (of a process) etc
Example
lā拉shēn伸shì是yùn dòng运动qián hòu前后bù不kě可hū lüè忽略de的zhòng yào重要huán jié环节。
拉伸是运动前后不可忽略的重要环节。
Stretching is an important part of exercise that should not be ignored before and after workouts.