For example, you can rename a column, alter its length, specify a default value, and so on.
例如，可以重命名列，更改其长度，指定默认值等等。
Its weight is so massive. Experts projected it could slightly alter the earth's axis and increase the length of every day by a macroscopic amount.
一个中国内地的内海，由于重量惊人。专家预计会轻微改变地轴，让每天增长一点点。
Some believe its risky to alter Earths orbit, while others fear the jump will make the Gregorian calendar obsolete because of the length of Earths new orbit.
有些人认为改变地球轨道太危险，其他一些人则担心由于这一跳会使地球轨道变长，所以要改写公历。
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