Someone who is very worried or upset.
一个非常担心或不安的人。 (Yī gè fēicháng dānxīn huò bù'ān de rén.)
"He’s a nervous wreck before every exam."
"他在每次考试前都是一个紧张的残骸。" (Tā zài měi cì kǎoshì qián dōu shì yī gè jǐnzhāng de cánhái.)
to improve an existing product or idea
to progress or improve very quickly
to establish a rule or principle
to reach a stage of maturity or full potential
decisions made based on factual data rather than assumptions
the best of a group; the finest selection
