水流小端 plastic flow at crack tip: 裂纹顶端塑性流变tip leakage flow: 顶部泄漏流量tip vortex flow: 梢涡流tip-leakage flow: 顶部泄漏流量tip-vortex flow: 梢涡流下载手机词典可随时随地查词查翻译