length : the number of character for the word
word : the text
sentence : that sentence that word can be used, the word is changed to pinyin to show the word's location
english ; the meaning of that sentence
HSK ; the level that the word belong to

length: 1
sentence: 种树前,我们先用铁锹挖了些keng1。
english: We dig some pits with a spade before planting the trees.
HSK: 6