1 . 四个
四个小时的酸雨[146]酸雨流进[水坑里]持续four(四个)Hour(小时)
2 . 四
formula公式four四,四个fraction分数
3 . 四种
wall decoration common form following four., 墙面常见的装修方式有以下四种.
4 . 4个
fourpeople have been arrested after police say one of them was found to have rifles , a bullet-proof vest and-talkies in his truck .当警察发现一个嫌疑人中的货车里有步枪,防弹衣和对讲机之后逮捕了4个嫌疑人。