Old tires line the floating dock to protect the boats.
船坞外缘贴着一圈旧轮胎，用来保护进坞的船只。
The problem is in line 4, which uses floor division instead of floating-point division.
那问题实际是在第四行，应该用浮点除法，结果多打了一个右斜杠，弄成了地板除法，才导致的错误。
The problem is in line 4, which uses floor division instead of floating-point division.
那问题实际是在第四行，应该用浮点除法，结果多打了一个右斜杠，弄成了地板除法，才导致的错误。
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