The diurnal rhythm of the city starts early in the morning.

城市的每日的节奏从清晨开始。

Thus Euglena shows a diurnal rhythm in the speed at which it moves to a light source.

当眼虫被放在强光下时，仍能表现出昼夜节律。

The diurnal rhythm of blood pressure is clinically significant, especially in patients with hypertension.

人体血压的昼夜节律现象具有重要临床意义，高血压病是尤为如此。