四次

yǐ yǒu sì cì shì gù shè jí lín wù jú de fēi jī

已有四次事故涉及林务局的飞机。

There have been four accidents involving Forest Service planes.

wǒ dǎ gōng de nà jiā fú shì diàn yī nián yǒu sì cì huàn jì dà shuǎi mài

我打工的那家服饰店一年有四次换季大甩卖。

The clothing store I work for has four end-of-season sales per year.