"We can detect sunspots at a depth of 60,000 kilometers, but if we try to detect them deeper or closer to the surface, the travel-time shift becomes weaker," Ilonidis says.

“我们能探测六万公里深处的黑子，但如果探测更深些或者更靠近太阳表面的位置时，(声波的)传播时间的变化将变得不明显，”Ilonidis说。

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"We can detect sunspots at a depth of 60, 000 kilometers, but if we try to detect them deeper or closer to the surface, the travel-time shift becomes weaker," Ilonidis says.

“我们能探测六万公里深处的黑子，但如果探测更深些或者更靠近太阳表面的位置时，(声波的)传播时间的变化将变得不明显，”Ilonidis说。

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Below this depth, there is an abrupt shift to colder, saltier water.

在这一深度以下，水陡然变得更冰冷，咸度更大。

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Film-makers have always relied on tools like lighting and depth-of-field to shift the audience's perspective, but the convergence of animation and 3D has made them pay greater attention to detail.

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China's strategic shift to high-tech war capability and the geographic expansion of its defense depth -- by blurring the distinction between its defensive and offensive weapons -- has alarmed neighbors.

CNN: VIEWPOINT

Specifically, we are considering a shift in our audit activities to higher dollar awards while further instructing auditors to ask more in depth questions on the bottom line issue of whether taxpayer funds were used correctly.

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