单词学习：heliotropism 生物学/植物学
heliotropism
/ˌhiːliˈɒtrəpɪzəm/
向光性，趋日性
The students observed the plant's heliotropism as its leaves gradually turned towards the sunlight, and Mr. Gu explained that this was a survival mechanism.
学生们观察到植物的向光性，它的叶子逐渐转向阳光，顾老师解释说这是一种生存机制。
单词卡片
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