[bù dàn]
not only
Laboratory work needs not only accurate measurements but also correct calculation.
实验工作不但需要准确的测量， 而且需要准确的计算。
In production， we demand not only quantity but also quality.
我们的产品不但要求数量多， 而且要求质量高。
Not only is the position of the earth changing but the earth itself is undergoing change.
不但地球的位置在变化， 而且地球本身也在经历着变化。
One should not only observe but also help.
不但要看， 而且要帮。