In order to prevent us from drawing one poly more than one time we should have a flag on each polygon which will be set if the poly is drawn for the first time.
为了防止重画一个多边形，我们应当在每一个多边形上做一个标记，当多边形第一次被画的时候，设置这个标记当然画之前也要检查这个标记啦，不过肯定影响效率。
Poly(succinimide)(PSI) was synthesized by polycondensation of L-aspartic acid in a solvent. The effects of the catalyst, reaction time and solvent on the reaction were studied.
以L 天冬氨酸为原料，采用溶剂法合成聚琥珀酰亚胺，并研究了催化剂、反应时间和混和溶剂配比对反应的影响。
Chinese negotiators view time as an endless cycle so they make a poly-chronic use of time.
中国人认为时间是没有终点的并成循环运动的状态，因此他们倾向于在同一时间段内做多项工作。
The changes of intrinsic viscosity and end carboxyl group content with temperature and time were studied for poly(trimethylene terephthalate)(PTT), PET and CDP.
研究了聚对苯二甲酸丙二醇酯（PTT） ，PET ，C DP在不同温度和时间下的特性粘数和端羧基含量的变化。
With the merits of higher fluidity effect and preventing concrete mix from slump-loss with time duration, poly-carboxylic acid series water-reducer agent (WRA) has been widely studying.
聚羧酸系减水剂具有高减水率和抑制混凝土坍落度经时损失的优点，研究开发新型的聚羧酸系减水剂受到国内外广泛关注。
In this paper studying on the polymerization reaction in silicic acid solution is determined and the gel time of poly silicic acid is obtained when acetic acid compound exist.
摘要在前人研究工作的基础上，应用乙酸进行硅酸聚合胶凝的实验研究，实验结果表明，当硅酸溶液中有乙酸化合物时，硅酸聚合胶凝的时间将延长。
Therefore, it is possible to realize poly-dimension utilization of space-time resources within solar greenhouses by adopting rational crop planting system.
结论：根据日光温室内的温光条件，通过合理的作物种植制度，可以实现对日光温室内时空资源的多维利用。
Furthermore, the problem how to shorten the displacement time and establish the saturated adsorption of the poly...
此外，就如何缩短驱替时间，更好地建立岩心中聚合物的饱和吸附问题也进行了讨论。
We need also poly spandex jersey printing ( polyester 90 %, spandex 10 % ) 200gr / m as the picture and more design, send me your design, prices, time of delivery. asap.
我们同时也需要聚乙烯和弹性纤维材料，有印花带图像的运动衫（聚乙烯含90 ， 10的弹性纤维） ， 200克/平方，请发送你们的样式，并告知价格和交货期。
We need also poly spandex jersey printing ( polyester 90 %, spandex 10 % ) 200gr / m as the picture and more design, send me your design, prices, time of delivery. asap.
我们同时也需要聚乙烯和弹性纤维材料，有印花带图像的运动衫（聚乙烯含90 ， 10的弹性纤维） ， 200克/平方，请发送你们的样式，并告知价格和交货期。
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