Article 2all units and individuals with aircraft under their charge and all flight-related persons and their flight activities shall abide by these Rules.

第二条凡辖有航空器的单位、个人和与飞行有关的人员及其飞行活动，必须遵守本规则。

youdao

Daily activities, such as walking up a short flight of stairs or carrying a suitcase, can become very difficult as the condition gradually worsens.

随着病情的逐渐恶化，像爬一段较短的楼梯或提一个手提箱这样的日常活动，都会变得非常困难。

youdao

Daily activities, such as walking up a short flight of stairs, may become very difficult as the disease worsens.

病情严重时，走上一小段楼梯这种日常活动都可能感到很困难。

youdao

The FAA also will permit Boeing to begin test flight activities relating to the battery issue.

CNN: FAA approves proposal for fixing Dreamliner battery woes

Immediately upon indication of a loss of communications on STS-107, at a little after 9:00 a.m. this morning, we began our contingency plan to preserve all the information relative to the flight activities.

CNN: O'Keefe: 'A tragic day for the NASA family'

Officials know perfectly well that passengers will already have imbibed all the fructarian juices imaginable on the ground and will welcome the alternative of these expensively imported, highly calorific pop drinks to keep their energy levels up during random in-flight activities like mass seat changes and locating serviceable toilets.

CNN: From Our Correspondent: On a Magical Hill