The theory marks a change in approach from previous research which looked into using expensive military Star Wars-style lasers to destroy space junk.
这套理论改变了我们以往关于清理太空垃圾的看法，以前的研究倾向于运用昂贵的军事激光去摧毁太空垃圾。
In her first letter to Marks &Co., Helene Hanff encloses a wish list, but warns, "The phrase 'antiquarian booksellers' scares me somewhat, as I equate 'antique' with expensive."
海莲·汉芙在寄给“马克思与科恩”书店的第一封信写到：“‘古旧书商’的字眼着实吓了我一跳，在我的印象里，‘古旧’和昂贵没什么区别。” 随信，她寄去了自己想要的书目。
Graff laser-marks his most expensive stones.
格拉夫在他最昂贵的珠宝上都做了镭射标记。
Graff laser-marks his most expensive stones.
格拉夫在他最昂贵的珠宝上都做了镭射标记。
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