四年级下-1

练习内容

[{"word":"first floor","pronun":"[fɝ​st flɔr]","translation":"n. 地面以上的一层；底层","audio":"first_floor.mp3"},{"word":"second floor","pronun":"","translation":"na. 〈美〉二楼；〈英〉三楼","audio":"second_floor.mp3"},{