Specimen surface with no changes 试样表面无变化
The zero point of the density scale is defined by having no specimen in the densitometer.
定义密度计内没有样品时的密度为密度尺标的零点。
The specimen, complete with surrounding rock, had been on display for the past 50 years at a museum in Poland, but amazingly no one had spotted the footprint.
这个标本连同周围的岩石,在过去的50年里一直在波兰的一家博物馆陈列,但令人惊讶的是,从未有人发现这个脚印。
They had no backbone and were tiny - the new specimen is only an inch long.
它们没有脊椎,体型娇小——这个新的标本只有一英寸长。
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