Drug resistance is the main restriction factor for clinical usage of taxanes.
耐药是影响紫杉类药物临床疗效的重要因素。
The most typical weather restriction of Free-space Optical Communications System is the fog; the fog attenuation of laser is a main factor that affects the performance of the lasers communication.
雾是制约无线光通信系统的最典型气象条件，它对激光的衰减效应是影响光通信性能的主要因素。
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