Falling on the 9th day of the 9th lunar month, the Chongyang Festival is also called the Double Ninth Festival.

重阳节也叫双九节，落在农历九月初九。

Every year on the Double Ninth Festival, we visit the elderly.

每年的重阳节，我们都会去看望老人。

On the Double Ninth Festival, people climb mountains to enjoy the view.

在重阳节这天，人们会登高望远。

Her clothes spread out on the double bed.

她的衣服散乱地铺满了双人床。

Don't park on the double yellow lines. ;

不要把车停在双黄线处。

THz switch based on the double barrier RTS is studied.

研究了共振隧穿结的THz开关特性.

The Model Predictive Control is applied on the double pendulum on the basis thethe double pendulum.

在此基础上,把预测控制算法应用于倒立摆控制系统.

Fire engines came on the double when the house was on fire.

房子着火后， 救火车很快就来了。

He looked at the double line of peasants and he spat on the ground.

他望望两排农民，朝地上啐了一口唾沫。

On the other side of the double doors Jun leaned against the counter.

在两边开的门六月的另一边上倚靠柜台.