unwritten

英[ʌn'ritn]美[ʌn'ritn]

a.
1.未写下的；不成文的；口头的
2.没写字的，空白的

同：	[a.] ad-lib, oral, spontaneous
反：	[a.] written

According to an unwritten rule in old families, grandparents were expected to pay for the grandson's wet nurse
依照旧家庭的不成文法，孙子的乳母应当由祖父母出钱雇的。收藏
The unwritten laws of good sportsmanship.
运动员精神的不成文准则收藏
Alice is accused of sinning against this unwritten law.
爱丽斯被指责违反这条不成文法。收藏

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based on custom rather than documentation
- an unwritten law
- rites...so ancient that they well might have had their unwritten origins in Aurignacian times
[反] written
using speech rather than writing
- an oral tradition
- an oral agreement
[同] oral, unwritten

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