四年级-下册-5

练习内容

[{"word":"safe","pronun":"[seɪf]","translation":"安全的","audio":"word_safe_9dfc8dce_entry.mp3"},{"word":"by","pronun":"[baɪ]","translation":"（表示方式）","audio":"word_by_df3f079d_entry.mp3"},{"word":"bus","