原材料
yuán cái liào · HSK 7
raw materials
🪵⛏️ 原 raw/original + 材料 materials = unprocessed raw materials
材料 already means materials; adding 原 (original, raw, source) marks them as the unprocessed source materials before any factory turns them into goods.
原 — cliff 厂 + spring 泉 (white 白 + water 水)
Originally a pictograph showing a spring of water flowing out from beneath a cliff, depicting the source of a stream. From this concrete image of a water source, the meaning extended to 'origin,' 'source,' and 'original.' A separate character 源 was later created with the water radical 氵 to keep the literal 'spring' sense.
料 — rice 米 + dipper 斗
料 combines 米 (rice/grain) with 斗 (a measuring dipper), depicting the act of measuring out grain. From this concrete sense it extended to 'to measure, estimate, anticipate' and to 'materials' (things measured out for use), as in 材料 'materials' and 预料 'to anticipate'.