两个氢原子和一个氧原子结合组成一个水分子。
Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.
寻找一条有效结合组成系统的上千个硬盘是一大挑战。
Finding a way to efficiently combine the thousands of hard drives that the system is built from was one challenge.
大的腺体，如胰腺或大的唾液腺，是由管道或小袋的复杂结合组成的。
Large glands, such as the pancreas or the large salivary glands, consist of complicated combinations of tubes or little sacs.
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