... occasional tinnitus 释义：偶发性耳鸣 occasional crossing 释义：偶然杂交 occasional drug user 释义：偶用麻药者 ...
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不管你叫他们是因故意或偶然杂交改良。
Whatever you call them they are the result of either deliberate or accidental crossbreeding.
1964年，袁先生偶然发现了一株天然杂交水稻。
In 1964, Yuan found a natural hybrid rice plant by accident.
北极熊和棕熊在大约15万年前进化为不同的物种，但是自那时起开始出现偶然的杂交。
Polar bears and brown bears became distinct species around 150, 000 years ago, but have occasionally interbred ever since.
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