However, creep of concrete and its influence on bridge structures are hard to predict and control. The calculation is very complicated and the results are not accurate.

然而，混凝土的徐变及其对桥梁结构性能影响的预计和控制，是十分复杂又难以获得精确答案的问题。

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The economic system and its movement trajectory do not exist in isolation, but inlay in very complicated social relationships, social organizations, and a cultural environment.

经济制度及其运行轨迹并非孤立地存在，而是嵌入于复杂的社会关系、社会组织及文化环境之中。

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Its development is a complicated course adjusted by a lot of genes. The physiological and molecular regulation mechanism are not very clear of the fibre development.

但由于其发育是受多个基因共同调控的复杂过程，至今对发育各阶段分子生理调控机制还不十分清楚。

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The lawsuit is complicated and a little weak by its very nature since it attacks Goldman for not making the proper representations rather than for underlying behavior that violated the law.

FORBES: Round One: SEC 1, Goldman 0