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Each row should be about 30 centimetres apart .

每一行之间保持大约30厘米的距离。

It weighs only 17 grams and is about 2.8 centimetres long .

体重只有17克，长约2.8厘米。

Sea levels have risen by 20 centimetres ( 8 inches ) in the past century .

海平面在过去的一个世纪中，上升了20多厘米，折合8英寸。

Dr lavan reckons that two of his protocells , measuring several centimetres across , could run a portable mp3 player for about 10 hours .

拉文博士估算，两个相距几厘米的原细胞就可以给一个便携mp3供电10小时左右。

In the 2 million years after the appearance of the first tools , hominin brain size more than doubled , to around 900 cubic centimetres .

在第一种工具出现之后的两百万年里，古人类的大脑体积增加了一倍多，达到约900立方厘米。