Ssq
abbr. simple sinusoidal quantity 简单的正弦曲线数
🗣️ 情景例句
and sometimes there isn't.
有时候没有。
One cannot eat one's cake and have it.
事难两全其美。
From 1830 onwards in the USA and from about 1870 in Canada, settlers began to move westwards and to take possession of the plains as their own.
美国自1830年起，加拿大从1870年左右起，殖民者开始向西迁移，并把平原据为己有。