逐一 zhúyī one by one
How to remember 逐一: 逐 to pursue + 一 one = one by one.
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How it is used
- 'One by one, one at a time' - an adverb before a verb - 逐一检查 (zhúyī jiǎnchá) inspect one by one.
- Written/formal; in speech people more often say 一个一个地. Near-synonym 逐个 (zhúgè) is interchangeable here.
- Signals careful, exhaustive, item-by-item handling.