3 · en
Short, simple sentences with “centimetre”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Beta radioactive particles can penetrate about one centimetre into tissues, and damage can occur to the skin but not to internal organs, unless ingested or breathed in.
In one square centimetre of human skin there are approximately 3 million cells, 95 sweat glands, 14 oil glands, 10 hairs, 90 centimetres of blood vessels, 2,900 sensory cells and more than 3 million microscopic creatures.
"The X-30 must have enough room to be able to carry all the fuel needed to get into orbit," says Dr Kobert R. Barthelemy, civilian manager of the NASP project, "and the engine efficiency must be extremely high - around 95 per cent - so that it can get the most energy out of every cubic centimetre of fuel. If we don't achieve this, we will never get into orbit.
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