keep a balance还是 keep the balance
问题描述：
keep a balance还是 keep the balance
答
如果你有不同的balances,但只能选一个,keep a balance也不错.
但从逻辑上讲,这个balance通常是有所指的,所以一般都说keep the balance.
由于the在说话中很轻,有时听起来像keep balance.