两变色的

Moreover, one novel photochromic compound: 3,3-bis(4-methoxybenzyl)-3H-naphtho[2,1-b]pyran has been synthesized, which may be used in optical lenses to protect human eyes from being damaged by ultraviolet lights.

该化合物具有较好的光致变色性质，其开环式的颜色与吡啶并苯恶嗪的颜色互补，这两种化合物相结合构成第二代Transitions镜片的基础。

In present investigation, the Micro-computer Controlled Color-changeable High Speed Stroboscopic Photography System, jointly developed by us and the Optical Engineering Department of our university, was successfuly utilized to measure the particle motion in the furnace.

本论文首次较成功地将与浙大光仪系合作开发的微机控制的变色闪频高速摄影系统用于W炉内气固两相流中颗粒运动的测量，得到了颗粒运动的速度矢量及运行轨迹。

In recent years, photochromism has great development in basic study and application. Especially heteraryl fulgide family compound attracts more attentions of scientists and engineers.

近年来，有机光致变色学在基础研究和应用开发两个方面都获得了重大进展，其中芳杂环取代俘精酸酐家族化合物是最引人注目的热点之一。

But since it is a two-color machine wet wet stack business card printing and membership card production, often in drag-and-shoot two angle on the nonanatomical of a, b, this requires a doubling in the process, the proper sequence to change color.

但双色机由于是湿叠湿制卡和会员卡制息，不常在拖梢两只角上爆发不法规的A、B轻影，这不离请求在工艺安插时，不合改变色跋来处置。

Also, it's usually charged per tooth, so you can save money if you only have one or two teeth that are discoloured and need whitening, as is often the case.

而且，这种方法经常是按每颗牙来收费，因此如果你只有一两颗牙齿变色严重需要增白的话，你可以省下一笔银子了，这也是一种经常的情况。

Materials and methods: Vitro model of discolored teeth: Sample of fresh erythrocytes was placed in the pulp cavity of 20 extracted teeth and centrifuged twice daily for 25 minutes over a period of 3 consecutive days.

材料与方法：在20颗因正畸拔除的健康离体牙髓腔内封入新鲜红细胞，以2500rpm／min离心25分钟，每天两次，连续离心3天制备变色牙模型。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。