The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.

现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。

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Production costs in Iraq are low, particularly compared to the more complex offshore developments.

伊拉克的生产成本很低，特别是与更为复杂的海上开发相比。

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Trade in good, complex carbohydrates (low glycemic index) for the bad, simple carbs (sugar).

用低糖或者复杂的糖类代替不良单糖。

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Many of them may live in the huge low-income housing complex that has just been named in Justice Sotomayor's honor.

VOA: standard.2010.06.05

Currently, Papalia is keeping close watch on people who are trying the high-protein, low complex-carbohydrate carb diet popularized by Dr. Robert C.

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Some 113 people are in shelters in Escambia County due to the storm, and residents of a low-lying apartment complex were ordered to evacuate, the spokesman added.

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His mother, identified Wednesday as Kiana Workman, 38, of New York City's Brooklyn borough, was discovered dead Tuesday on the floor of her bedroom at a tidy, low-rise apartment complex in Union Township, about 15 miles from New York City.

WSJ: NJ boy found with dead mom weighed 26 pounds