2 sentences for 流行 (liú​xíng — spread)

1. 这种流感病毒在冬季很容易流行。

   zhè zhǒng liú​gǎn bìng​dú zài dōng​jì hěn róng​yì liú​xíng.

   This flu virus spreads easily in winter.

   Source: Dong Chinese Dictionary

2. 当年煞在台湾流行时，大家都很紧张。

   dāng​nián shà zài Tái​wān liú​xíng shí, dà​jiā dōu hěn jǐn​zhāng.

   When SARS was prevalent in Taiwan, everyone was very nervous.

   Source: Dong Chinese Dictionary