Take some extra time to personalize each one; add an embellishment such as a colored semi-precious stone or store bought crystal.
再花些时间对每张邀请函做些个性化设置，添加一些修饰，例如彩色的半宝石或是从商店买的水晶。
2
Medieval reliquaries are usually made of luxurious materials: gold, silver and rock crystal. They are inset with ancient cameos and intaglios, precious and semi-precious stones and enamels.
中世纪的圣髑盒大都由黄金、白银或是水晶制成，用料奢华，缀以玛瑙浮雕、宝石、半宝石，包以瓷釉。
3
The ground state energies of a shallow donor impurity near a sharp surface of a semi-infinite crystal are studied.