1. 每日的：diurnal wind 日变风 | diurnal 每日的 | divalent 二价的

2. 昼间的：diurnal variation 昼夜变化 | diurnal 昼间的 | diurnally 每日;只在白天

3. 昼夜的：dither 发抖 | diurnal 昼夜的 | divergence 分散性

4. 昼行性的：diuretic 利尿剂 | diurnal 昼行性的 | diurnal periodicity 日周期

1. 白昼的;白天的;日间活动的
Diurnal means happening or active during the daytime.

e.g. Kangaroos are diurnal animals.
袋鼠是日间活动的动物。

adj

1. of or belonging to or active during the day

e.g. diurnal animals are active during the day
diurnal flowers are open during the day and closed at night
diurnal and nocturnal offices

2. having a daily cycle or occurring every day

e.g. diurnal rotation of the heavens