Sed
abbr. 航天工程文獻（Space Engineering Document）；光譜能量分布（Spectral Energy Distribution）
??? 情景例句
I've been thinking about it for weeks now.
為這事我想了幾個星期。
It's difficult to make a decision whithout knowing all the facts.
不了解所有事實而做出決定是困難的。
They plan to immigrate to Finland next year.
他們計劃明年移居芬蘭。