Gray powder metal, pure, without any visible inclusions and oxidation color.

灰色粉末状金属，纯净、无肉眼可见夹杂物及氧化色。

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Without any visible decision making at a higher level, it chooses a new nest site, signals workers to begin building, and governs itself.

在没有上级作出任何可见决策的情况下，蚁群选定一个新的地点，发出信号让工蚁开始建巢，然后就开始进行自我管理。

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The effect, for viewers a few metres away, is a lifelike, full-sized 3-D moving image of a person that appears to float in space, without any visible screen.

如果观众站在几米以外的话，就可以看到一个真实大小的3D幻象漂浮在空中，而看不见屏幕。

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The reality is that Dallas-based Southwest Airlines has maintained an 11% capacity growth rate--measured by available seat miles--over the past five years without any visible effect on profitability.

FORBES: The Ghost of Crandall

The reality is that Dallas, Texas-based Southwest Airlines has maintained an 11% capacity growth rate--measured by available seat miles--over the past five years without any visible effect on profitability.

FORBES: The ghost of Crandall

He said he believes as the surgical technique continues to improve, it will allow for earlier surgeries and babies may be born without any visible evidence of previous surgery.

CNN: Study: Major benefits for spina bifida surgery in the womb