Moreover, Japan's perfect social security system, make people unnecessary "and", this also is to join the ranks of the "dink" family increasing number of Japanese young couple important reasons.

此外，日本完善的社会保障体系，使得人们不必要“养儿防老”，这也是加入“丁克”家庭行列的日本年轻夫妇数量增多的重要原因。

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Parents have been told to make sure their children are kept indoors and people are being asked not to make any unnecessary noise.

父母们被告知要确保他们的孩子呆在家中，人们也被要求尽量不要制造出任何不必要的噪声。

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Some inventions, such as the telephone, make it unnecessary for people to meet face-to-face.

有些发明，例如电话，使得人们不需要面对面交谈。

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But one rule that surprises many people can make entry into the IRS programs unnecessary.

FORBES: IRS Gives Big Break To Some Offshore Account Holders

Most groups campaigning for intersex people now advocate that doctors should not perform medically unnecessary genital surgeries on intersex babies to make them male or female.

CNN: Gender row athlete: What is intersexuality?