你的行动必须紧密围绕着大众利益。
This is when your actions need to be centered around what is in "everybody's" best interest.
其中的DNA长链盘绕紧密围绕一个名为“组蛋白的蛋白质组。”
Where long strands of DNA are tightly coiled around a group of proteins called "histones."
安全措施紧密围绕发射场，其中约1600名警察守卫。
Security was tight around the launch site, where about 1, 600 police were on guard.
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