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参考系
參考系
cānkǎoxì
1. frame of reference

Character Breakdown

参
cān
to take part in, to intervene; ginseng
HSK 3 8 丶
考
kǎo
to test, to investigate, to examine
HSK 2 6 丶
系
xì
system; line, link, connection
HSK 1 7 丶

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Chinese