乌龟以极慢的速度向前爬。
平均来说，这些苔藓以每年大约1毫米的极慢速度生长，而某些草皮有数米厚。
On average these mosses grow at the glacial speed of 1 millimeter per year-and some of the turfs are meters thick.
银的天然杀菌能力来源于其以极慢速度释放的银离子（带电的原子或原子团）。
Silver's natural germ-killing ability stems from its extremely slow release of silver ions (electrically charged atoms, or groups of atoms).
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