We discovered that they can go through three-millimeter gaps, the height of two pennies, two stacked pennies, and when they do this, they can actually run through those confined spaces at high speeds, although you never see it.
我们发现它们可以穿过 三毫米的缝隙， 也就两个1分币摞起来那么高。 而当它们钻进去时， 它们实际上以很高的速度 穿过这些狭窄空间， 虽然你根本看不见。