Abstract: : In traffic construction, tunnel occupies a very important position.
摘要：在交通建设中，隧道占据着十分重要的地位。
William Gaddis (1922-1998) occupies a very important position in postmodern American literature.
威廉·加迪斯(1922—1998)在美国后现代派文学中占有重要地位。
Positive definite matrix occupies a very important position in matrix theory, and has great value in practice.
正定矩阵在矩阵论中占有十分重要的地位，在实际中也有广泛的应用价值。
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