周长不等 meaning in English

inequality in circumference

This seamless belt has overcome the trouble of ruptures at the joints of the original conveyor belts , so as to prevent joints from having seams to leave traces when bonding cloth and the trouble of poor stability because of unequal circumferences at the joints of the original conveyor belts leading to belt going deviated
它克服以往输送带的接口连接处断裂的现象，避免了有接缝带接口，在粘合布料时留下痕迹，有缝带连接处周长不等而造成行稳定性差、跑偏偏带等现象。