删除或丢失。例如，丢失位，丢失有效数字。
To delete or miss out; for example, drop bits, drop significant digits.
如果不希望丢失位，请在对值进行移位之前，先将它强制转换为64位数。
If you do not want to lose bits, cast the value to be shifted to a 64-bit quantity before it is shifted.
一位艺术家最近乘渡船到南岛时，偶然发现了一个丢失已久的古董花瓶。
An artist who was recently traveling on a ferry to the southern island discovered by chance a long lost antique vase.
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