Normal, double - helix DNA is spiral, like a loosely coiled spring.正常的双螺旋DNA是螺旋形的, 像一根松松地卷曲的弹簧.The spirally coiled central filament of a chromatid along which the chromomeres are aligned.染色线,染色''.'丝'....
在后的,将要在前; 在前的,将要在后.So the last will be first, and the first will be last.喝酒时应按照新在先陈在后、淡在先浓在后的原则.When drinking sequence of new wine and light wine should be tasted firstly is a rule.然而,有许多在前的,将要在后;在后的,将要在前.But many who ar...