在人群中逆行是很危险的行为。

Zài rénqún zhōng nìxíng shì hěn wēixiǎn de xíngwéi.

Moving against the flow in a crowd is a dangerous behavior.

车辆不应该在禁止逆行的路段行驶。

Chēliàng bù yīnggāi zài jìnzhǐ nìxíng de lùduàn xíngshǐ.

Vehicles should not drive against the flow in prohibited areas.

生活中，我们要有勇气逆行。

Shēnghuó zhōng, wǒmen yào yǒu yǒngqì nìxíng.

In life, we need the courage to go against the flow.