Did you concentrate mainly on form or content?

你主要关注的是形式还是内容？

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This tropical region's economy is based mainly on farming.

这个热带地区的经济主要以农业为基础。

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The Arctic foxes feed mainly on birds, birds' eggs and other small animals.

北极狐主要以鸟类、鸟蛋和其他小动物为食。

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But animal doctor Pradeep Singhal blames the decrease in camels mainly on the influence of the outside world.

VOA: special.2009.01.13

Take, for example, "The rain in Spain falls mainly on the plain."

看，西班牙之雨大多洒落于平原之上“

耶鲁公开课 - 文学理论导论课程节选

whereas director should be, ideally should be focused mainly on a creative side

然而，导演应该，理想的是，应该主要专注于创新方面，

如果要拍摄电影 - SpeakingMax英语口语达人

This article is for a global audience, and has focused mainly on international policy.

ECONOMIST: Tony Blair

Nowadays the island trades mainly on its archaeological heritage, with a smattering of tourism.

ECONOMIST: Easter Island

In the past, Intel and other chipmakers have focused mainly on delivering energy-efficient performance and connectivity.

FORBES: McAfee Could Lift Intel Above $25