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1.flock to 涌到
例句：These people are willing to take the risk of having an opinion, and so others flock to them, like pedestrians running for shelter during a downpour.
这些人甘冒风险大胆发表自己的意见，其他人就会随之聚集在其周围，就像行人在下暴雨时寻求遮蔽物一样。
2.security concern 安全问题
例句：However, this is not necessarily a security concern since the file system access control mechanism usually provides sufficient protection.
不过您也不必担心安全问题，因为文件系统访问控制机制通常都可以提供充分的保护。
3.be part of 成为…的一部分
例句：Business representatives should also be part of this group.
商业代表也应该是这个组的一部分。
4.pelt with 用(某物)扔某人
例句：The children pelt each other with snowballs.
孩子们互相投掷雪球。
