Teamwork improves with time: America's National Transportation Safety Board found that 73% of the incidents in its civil-aviation database occurred on a crew's first day of flying together.

团队合作会随时间推移而改善：美国国家运输安全委员会发现，其民用航空数据库中，73%的事故发生在机组人员一起飞行的第一天。

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School safety must come first all the time.

学校安全必须始终放在第一位。

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But this is not the first time that massey-the fourth-largest coal company in america-has come under fire for its safety practices.

但这并不是第一次梅西公司——美国第四大煤矿企业，由于安全措施受到严重的批评。

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Furlong used the word "bizarre" to describe the weather on Cypress Mountain for this time of year, and added that safety comes first.

VOA: standard.2010.02.16

In addition to providing a nationwide, interoperable network for Public Safety for the first time, it would provide the ability to view real-time video, check license plates in real time, and download building layouts so fire fighters could see how the building is laid out and if there are any hazardous materials inside.

FORBES: 9/11 Safety Update: Why First Responder Communications Hasn't Improved In 10 Years

Given the conditions and new boat design this year, organizers for the first time had enacted new safety rules requiring sailors to wear crash helmets during practice and competition.

WSJ: Before America's Cup Capsize, Concerns About Safety

Each state has different requirements, but generally a first-time hunter must complete a safety education course in order to purchase a permit.

BBC: Shooting a Thanksgiving dinner