Sigmas
n. 希腊字母表的第十八字母（∑, σ）( sigma的名词复数 )
🗣️ 情景例句
But don't give up.
但是千万不要放弃。
He that would know what shall be must consider what has been.
欲知未然，须思已然。
it would be more like that of a bluebottle buzzing round the room;
那就像一只嗡嗡叫的绿头苍蝇在屋内飞行的轨迹，