I entered Laos without any knowledge about the country; I spoke no English and had no clue where my family had been taken.
我在进入老挝时对这个国家一无所知；我不会说英语，不知道我的家人被带到何处。
The principle about Redox Reaction is a main clue through the knowledge system of all the junior and senior Chemistry, which is the teaching emphasis and the difficulty.
氧化还原反应原理是贯穿中学化学知识系统的一条主线，是中学化学教学的重点和难点。
One clue is the knowledge and the other is the capacity to train .
两条线索中，一是知识线索，二是能力训练线索。
应用推荐