梅雨季节东西容易发霉: things easily get mildewed in the rainy season
前兆: omen; forewarning; premonition; foreshadow; forerunner 短语和例子暴风雨的前兆 warning signs [indications] of a storm; 成功的前兆 an omen of success; 地震的前兆 warning signs of an earthquake
强震前兆: forerunner earthquakeforerunner of strong earthquake