If the projection column list contains an expression, it must have a valid column alias.
如果projection列列表包含一个表达式，它必须拥有一个有效的列别名。
The projection matrix, operational formula, FOETEAN program and experimental results show that this algorithm is convenient and valid for dealing with minute displacement and deform…
结果表明，这种快速算法对于处理复杂形体的微小变位是方便而有效的。
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