The teacher explained the correct proportion for mixing colors.
老师讲解了调配颜色的正确比例。
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口语高分秘籍 
听力全真试题 8 And I don’t have too many videos where I go over the specific pronunciation of a single word, but I do happen to have one where I talk about this word, so I’ll put in a clip here that will go through the pronunciation, step-by-step.
然後我并没有很多影片,用来讲解一个单字
具体发音。可是我就刚好有一支,有讲过这个单字
。所以我会在这里放一支片段,一步一步地讲解这单字
发音。

听力全真试题 6 
听力全真试题 4