对熟人的招呼语；喂！接电话时的招呼语；表惊奇之声。
Used esp. as a familiar greeting or in answering the telephone or to express surprise.
虽然add_column看上去有点熟悉，但是您可能会惊奇地发现需要删除整个表，然后重新创建表，而不是使用remove_column。
While the add_column looks already familiar, you might be surprised to see the entire table needs to be dropped and then recreated, instead of using the remove_column.
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