相差 xiāngchà to differ
How to remember 相差: 相 mutual + 差 differ from = to differ.
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How it is used
- To differ by (a measurable gap) - 两人相差三岁 (liǎng rén xiāngchà sān suì) the two differ by three years, 相差很大 (xiāngchà hěn dà) differ greatly.
- Always about the size of a difference between two things, so it takes an amount; contrast 差别 (chābié, the difference itself as a noun).
- Neutral; common with numbers and quantities.