谢孟媛写的是at high/low price https://youtu.be/LGxpOr3-g4M?t=1392 其实应该是at a high/low price https://forum.wordreference.com/threads/at-a-high-price-at-high-price.1741595/ -- Practice doesn't necessarily make perfect, but it makes permanent. Premature practice (practice beyond the learner's competence) or practice without error correction makes imperfection permanent. --

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