那细小的孔完美地为神经细胞的生长提供了养份，同时也很好地清除了排泄物。
Tiny pores ideal for supplying nutrients to growing nerve cells and removing waste products.
把口琴放在嘴唇前面4厘米处，从口琴底部使劲往里面吹气，然后反过来再往口琴吹孔里面使劲吹气，这样应该可以清除里面的大部分灰尘。
Start by blowing hard into the back of your instrument, then blow hard into the holes, while holding the harmonica about 4 cm from your lips.
泥浆的主要功用之一是通过自身的循环，有效地清除钻孔内破碎下来的岩屑，特别是对于水平孔，可以避免砂床的形成，减少钻孔内的事故。
Drilling mud can clean out the cuttings by its circulation, especially for horizontal hole, it can avoid the sand-bed formation and reduce downhole troubles.
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