His smiling face appears on T-shirts, billboards, and posters.他的笑脸出现在T恤衫、公告牌和海报上面。He has nowhere to stick up his posters.他没地方贴海报了。We'd been making cakes and colouring the posters.我们一直在做蛋糕，给海报上色。...
The electronic addressed liquid crystal display forms different diffractive optical elements.该电寻址液晶显示器可形成不同的衍射光学元件.The diffractive efficiency is measured and the errors are analyzed.测量了菲涅耳透镜的衍射效率并分析产生误差的原因.These errors h...