1. 月下:below the mark不够标准 | below the moon月下 | below the salt在下席
2. 月下, 尘世:below the mark || 不够标准, 不好 | below the moon || 月下, 尘世 | below the salt || 在下席
1. Seen from above at a proper angle, the chartreuse arch below was exactly in the shape of the waxing moon.
2. It's rare because the moon is usually either above or below the plane of Earth's orbit.
3. Yet Earth's moon would not qualify because the two bodies'common center of gravity lies below the surface of the Earth.