Sigmic
a. ∑粒子的, 含∑粒子的
🗣️ 情景例句
She liked Pete, and they went to dances together.
她喜欢Pete， 他们也一起去跳舞。
Can you keep an eye on the baby while I go shopping?
你能否在我上街买东西的时照看一下孩子？
Thank you, sir.
谢谢，先生。