Besides having a high energy density, the long chains of hydrocarbons are also good building blocks for constructing more complex molecules, such as plastics and pharmaceutical drugs.

除含有高能量外，长链碳氢化合物也适合构建更复杂的分子，如塑料和药品。

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Since the intensification of urbanization, it not only brought great economic benefits, but also the population explosion, excessive building density, terrible traffic jam, and other problems.

城市化进程的不断加剧，在产生巨大经济效益的同时，也带来了城市人口膨胀、建筑密度过大、交通严重堵塞、环境持续恶化等一系列的问题。

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The two linked towers feature cantilevered balconies with irregular edges that disrupt the density of the building and provide areas where residents can look up, unimpeded, towards the sky.

两个连接的塔楼有悬挑的不规则边缘阳台，打乱了建筑的密度，居民可以向上、畅通无阻地欣赏天空的美景。

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Building large amounts of high density housing, which San Francisco and Oakland do already have, makes no sense if the people living there cannot get anywhere.

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Clearly, the success of Detroit Future City depends on building population density around certain neighborhoods that are already in decent shape and stabilizing home values there.

FORBES: Detroit's Innovative Survival Plan Is A Model For The World - But Will It Work?

Its main city, Portland, became the poster child of the "smart growth" movement by forcing up density, building an extensive light-rail system and restoring its urban core.

FORBES: New Geographer