The next significant question was how to predict the number of positive, negative and complex roots.

次一个重要的问题是怎样预知正根，负根和复根的个数。

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The consideration of damping force leads to a fact that there exist complex roots to the characteristic equation for the structures.

考虑阻尼力后，结构的特征方程应有复数根，因而通常用于求解多项式方程实数根的二分法不再适用。

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The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.

植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。

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Indexes have morphed from their market-matching beta roots to complex trading- and securities-weighting strategies that are supposed to add excess returns, known as alpha.

FORBES: No Free Lunch from Alternative Indexes

The roots of stagnation are complex.

ECONOMIST: A tale of two Mexicos

Whether filming hippos in the clear water of Mzima Spring, flamingo chicks in a dried-out soda lake or the complex layers of life within a massive baobab tree, the Roots always let their subjects tell their own stories making astonishing discoveries along the way.

ECONOMIST: Animals in Africa