短語詞組短語dynamic crack propagation problems 動態(tài)裂紋擴展問題dynamic crack propagation toughness 動態(tài)裂紋擴展韌性dynamic crack propagation speed 動態(tài)裂紋擴展速度crack dynamic propagation 裂紋動態(tài)擴展 返回 dynamic crack propagation