Qingming ("Pure Brightness"), the fifth of the 24 solar terms in the Chinese lunisolar calendar, occurring from the 4th or 5th of April until the 18th or 19th

being alive

be alive

proof; evidence; verification / (mathematics) proof

to prove; to confirm / (mathematics) to prove

Xinhai Revolution

apology, explanation

to apologize, to explain

writing clearly / clear specification in a document

write clearly / specify, spell out