One should not only observe but also help.
不但要看，而且要幫。
Things here are not only inexpensive but also of good quality.
這兒的東西又便宜又好。
Not only Jim but also his wife saw her.
不但吉姆而且他妻子也見到了她。
Not only cancer, but also heart and lung disease are influenced by smoking.
不僅是癌癥，還有心臟病和肺部疾病也都會受吸煙影響。
Laboratory work needs not only accurate measurements but also correct calculation.
實驗工作不但需要準確的測量，而且需要準確的計算。