有形普通股权益(TANGIBLE COMMON EQUITY)，名词，起源未知。
这两种物种之间的合作关系是如何起源的还是个未知数。
How the relationship between the two species originated is unknown.
四月愚人节的庆祝活动是在不同的方式在全世界范围内，确切的传统起源于它是未知的。
As April Fools' is celebrated in different ways throughout the world, it is unknown exactly how the tradition originated.
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