白宫医疗队称，要为奥巴马用较细的线缝合伤口，但是针数较多，以减小疤痕面积。
The White House Medical Unit said the number of stitches used was high in order to reduce the size of any scar.
这些线代表数层细胞，包括红细胞层，血小板层及纤维蛋白层，它们以血栓的形式存在于血管内。
These lines represent layers of red cells, platelets, and fibrin which are layed down in the vessel as the thrombus forms.
不同抽样方法的比较结果，以平行线法效果最好，并确定了理论抽样数。
The compared results of different sample methods showed that them eans of the parallel lines was the best one and the theoretical sample number was also determined.
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