单词学习：changeability noun (抽象名词)
changeability
/ˌtʃeɪndʒəˈbɪləti/
易变性；可变性；反复无常
The changeability of the weather in spring often makes Teacher Gu adjust his outdoor teaching plans.
春天天气的易变性常常让顾老师调整他的户外教学计划。
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