So the challenge is to increase the team's performance to raise the team's exposure, so the sponsors realise the marketing value of this platform.

所以，最大的挑战是提高车队成绩，来提高车队的上镜率，赞助商明白，这个平台可以提升他们的品牌知名度。

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Walter Lewin, though, has asked APOD to pose this as a challenge to astrophotographers: create a real single-exposure image of a clear night sky that features 360 degree star trails.

沃尔特·卢因通过APOD向广大天体摄影师发起挑战——拍摄一幅360度星流迹的单曝光晴朗夜空照片。

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Expanding exposure is another challenge.

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Much of the data is from observational studies which are subject to many biases, and there is the challenge of isolating and quantifying environmental exposure.

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The proliferation of cell phones, iPods and Facebook brings a complicated challenge for parents, teachers and students: The constant exposure to technology and the Web amplifies opportunities for children to bully each other online.

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