1. Spaced evenly from the bottom up, concentric rings of black crow feathers rise to the top of the cairn.

2. According to different generators, the concentric ring fractal array can be divided into the linear array, the plane triangular array, the flat square array and the hexagonal array.

3. It spreads out in bands of concentric ring roads, of which the fifth and outermost (the Sixth Ring Road) passes through several satellite towns.

4. This paper focuses on the concentric ring fractal array of the low side lobe characteristics in fractal antenna arrays.

5. The street plan of the city has evolved as a series of concentric rings.

6. These are usually made up of a central pit or cup, surrounded by one ring or concentric rings or spiral turns.

7. The other is a piece of reef shaped like a fungal bracket of concentric rings, or perhaps like a footprint cast.

8. One theory suggests that personality can be viewed as a series of concentric rings.

9. The largest craters show, in addition to their rim walls and central peak structures, outer concentric rings of mountains.

10. It is built of large blocks of travertine stone and the arch has two concentric rings of radiating voussoirs.

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11. It consists of hornblende gabbros, olivine pyroxenites, olivine gabbros, noritegabbros and anorthosites, these lithofacies belts extend in concentric ring form, and each other gradual transition.

12. Metal cock ring soft seat surface pressure to the bearing surfaces, such as the valve core and valve seat is concentric ring surface can be a double tight closure.