crack growth rates的用法和樣例：
例句
- Grain size had some effect on the rate of crack propagation.
晶粒尺寸大小對裂紋擴展速率也有影響。 - In this paper, various influencing factors of the crack propagation rate of superalloy are concluded, including external factors and internal factors.
總結了高溫合金的裂紋擴展速率的各種影響因素，包括外部因素和內部因素兩大類(lèi)。
