队(duì)
Origin:

“队”是“坠”的本字，甲骨文的字形是一个孩子从土山上坠落下来的状况，现在“队”的意思主要是“行列”、“军队”。
“队” is the original version of the character “坠.” On ancient oracle bone inscriptions, “队” looks likes a child falling down a hill. Now, it mainly means “row” or “military.”

Meaning:
a row of people; line；team; group

Words:

队列(duì liè) queue
队形(duì xíng): formation
队伍(duì wǔ): procession
排队(pái duì): to stand in line
一队学生(yī duì xué sheng): a group of students

Sentences:

1、Páiduì děngchē shì yīge rén jīběn de sùzhì.
排队等车是一个人基本的素质。
Waiting in line for a bus is a fundamental quality of being human

2、Qiánmiàn zǒu guò lái yīduì xuésheng ，tāmen shì lái cānguān de.
前面走过来一队学生，他们是来参观的。
In front, a group of students is coming. They are here to visit.

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