I try to pick up clues from the shoes they wear, the state of their fingernails, the depth of their laughter lines.

我会在很多地方找到线索，比如鞋子的款式、指甲的样子和笑纹的深度。

youdao

He uses his fingernails instead of a pick, which is quite common, except instead of plucking strings upward individually, he can play more than one string at a time by stroking down --- and up -- with the backs of his nails, which allows him to play several notes at once.

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