As a lifelong near-sighted person, prescription eyeglasses and especially prescription sunglasses have long commanded a high premiumdue to the seemingly precise and scarce nature of creating them.
作为一个终身近视患者，处方眼镜尤其是处方太阳镜因其所谓的精确性和制造材料的稀缺而价格一直居高不下。
2
This is an issue due to the fact that many people run portable software on their USB flash drives, so space may be at a premium.
由于很多人是在USB闪盘上使用便携软件的，这就造成了一个问题，所以空间的优先级应该更高。
3
The real action now is in branded generics, which command a premium in many emerging markets due in part to the fear that unknown products might be fake or of dubious quality.