虽然所有护照几乎都遵循了国际民用航空组织制定的标准，但每个国家执行规范时却略有差异。
Although all new passports conform, more or less, to standards laid down by the International Civil Aviation Organisation, each country implements the requirements somewhat differently.
阿克曼建议旅客选择来自工业化国家的航空公司，因为它们的安全标准往往是最缜密的。
Mr. Ackerman advises travelers to limit their air travel to carriers from industrialized countries because they tend to have the most thorough security standards.
简述钛合金大应力持久性能的研究过程及其在航空行业标准和国家军用标准中的应用情况。
The research of high stress endurance property of titanium alloy, and application for Aeronautical department standard and national military standard were described.
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