列入关注的理由：20世纪四次最大规模的火山爆发，圣塔玛里亚就占了一次，记录的火山爆发指数(VEI)为6级，留下了一个直径为700-1000米的火山口。
Reasons to worry: Santa María's last big blast was one of the four largest volcaniceruptions in the 20th century, registering a VEI magnitude of 6 and leaving a 700-by-1,000 meter craterbehind.
实践证明，该系统运行稳定可靠，测量精度达到了微米级，可以用于实际的直径测量。
Testing results show that this system runs stably and accurately, the measuring precision is in the range of micron and can be employed in practical diameter measurement.
达到N95等级的口罩可以滤除超过95%的直径大于0.3微米的颗粒物。
A mask rated N95 filters out more than 95% of particles larger than 0.3 microns.
它是一种借助于静电场作用对聚合物溶液或熔体进行纺丝的过程，它所形成的纤维直径为亚微米级。
It is a process that produces polymer fibers with diameter in the sub-micron range under the action of an external electric field imposed on a polymer solution or melt.
加大进气孔直径使进气中心涡流增强，燃油在一级燃烧室中蒸发量增加。
As the air inlet diameters increase, the intake central swirl is intensified and thus fuel evaporation in the first combustion chamber is improved.
通过改变催化剂和溶剂的用量，可以实现碳气凝胶的颗粒直径及孔洞由纳米到微米级的连续调节。
The structures of carbon aerogels are controlled from micro pore to macro pore by changing the concentration of catalyst and solvent.
静电纺丝是一种新技术，它可制备出直径为纳米级的丝，最小直径可至1纳米。
Electrospinning is a new technique, which can be used to prepare nanofibers with a diameter down to 1nm.
文多灵含量与一级侧枝数和茎直径的相关性达到显著水平（P<0.05），与节间距的相关性接近显著水平；
The correlation of vindoline content with the first lateral branch number and stem diameter reached the significant level (P<0.05), and near significant level with internodal distance.
几乎所有地区的前区20区22号材料，传感器，可提供接近开关到直径80毫米或在一级螺纹g1监视器。
Sensors for almost all materials in the Ex area zone 20 or zone 22 can be delivered as proximity switches up to 80 mm diameter or as used as level monitor with G1 thread.
结果显示，老年猫嗅觉二级神经元胞体直径和分布密度均有不同程度的显著性下降（P<0.05）；
Compared to the young cats, the number of secondary olfactory neurons in old cats declined significantly(P<0.05);
结果显示，老年猫嗅觉二级神经元胞体直径和分布密度均有不同程度的显著性下降（P<0.05）；
Compared to the young cats, the number of secondary olfactory neurons in old cats declined significantly(P<0.05);
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