Mixed standards refer to those functioning as complementary and arbitrary standards at some time , and as compulsory standards at other time.

所谓混合性规范，即有时发挥补充性任意性规范的功能，有时发挥强制性规范功能的法律规范。

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His country, Czechoslovakia, has had mixed fortunes even by European standards.

ECONOMIST: Otto Wichterle

But the standards have met with mixed reactions.

BBC: Consumers wants to limit the damage of their emissions

By most standards, American rates of mixed-race marriage have been low: one in 23 marriages in 1990, up to one in 15 in 2000.

ECONOMIST: The Americano dream