1. air-conditioning
2. changeable变化无常的brightly副词
我的答案是对的,请相信 :)翻译并写原因1. 在一个有空调的图书馆里学习很舒适。2. 春季的天气变化无常。有时阳光灿烂，有时整个星期都不停地下大雨。changeable变化无常的，符合句中的意思；shine是动词，后面跟副词brightlyair conditioning: a system or process for controlling the temperature, humidity, and sometimes the purity of the air in an interior, as of an office, theater, laboratory, or house, especially one capable of cooling.指空调设备或空调系统