在火星上，直径小于5公里的陨石坑相对较少。
On Mars, there are relatively few craters less than 5 kilometers in diameter.
这两种物质分别排列在直径小于50纳米的球体中。
The two substances themselves are arranged in tiny spheres less than 50 billionths of a metre across.
天文学家很少发现直径小于一百米（300英尺）的物体，并记录下来。
Very few objects smaller than 100 meters (300ft) across have been spotted and catalogued by astronomers.
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