This character 缶 is rarely used in Chinese. The meaning of this radical is borrowed from Japanese: 缶 (=かん) = box. It is understood as a pestle 午 in a mortar 凵. As the pestle 午 in the mortar is vertical, it has the meaning “noon” [wǔ], as the sun is then also vertical.
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Vocabulary
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淘汰
táo tài
to wash out; elimination (by selection); natural selection; to knock out (in a competition); to die out; to phase out
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