n. 【植物；植物学】向日性，趋日性。 positive heliotropism (茎叶的)向日性。 negative heliotropism (茎叶的)背日性。
an orienting response to the sun
Heliotropism is the diurnal motion or seasonal motion of plant parts (flowers or leaves) in response to the direction of the sun. It is a tropism.
例句与用法
1.
Heliotropism a form of phototropism in which flowers move to point toward the sun , tracking it as it moves across the sky 向日性：趋光性的一种类型，植物的花在一天内朝向太阳，并随着日光照射的方向而转移方位。
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