Sed
abbr. 航天工程文献（Space Engineering Document）；光谱能量分布（Spectral Energy Distribution）
🗣️ 情景例句
If you don't know a person's last name, use 'ma'am' or 'sir'.
如果你不知道一人的姓， 你应称呼他为 'ma'am' 或 'sir' 。
You have no goats,and yet you sell kids.
没有老山羊，还把小羊卖。
Such is human nature, that a great many people are often willing to sacrifice higher pay for the privilege of becoming white-collar workers.
许多人常常情愿放弃较高的薪水以换取做白领工人的殊荣，此乃人之常情。