Histones organize the dna and keep it from getting tangled , much like thread wrapped around a spool .
组蛋白组织dna并防止它杂乱，很像线缠在线轴上。
A common feature of these three spool is a holistic , integrated throughout the mandrel , easy installation and maintenance , replacement .
这三种阀芯的共同特点是具有整体性，整个芯轴为一体，易于安装维修、更换。
More of a luxury than a necessity for american global power , however , the initiative for nato attack came from france and britain , re-running as if in a time-warp the spool of the suez expedition .
