envelope

Please put the letter in a stamped envelope.

请把信放入贴好邮票的信封。

Include a self-addressed envelope for the reply.

附上一个写明回信地址的信封以便回复。

I sent the fragile item in a padded envelope.

我把易碎物品放在带衬垫的信封里寄出。

She spent the afternoon doing envelope stuffing for the campaign.

她整个下午都在为竞选活动装信封。

The engineers pushed the envelope to achieve faster speeds.

工程师们挑战极限，以获得更快的速度。

The test pilot explored the aircraft's flight envelope.

试飞员探索了飞机的飞行包线。

The new aircraft design pushes the envelope of current technology.

这种新型飞机设计突破了当前技术的极限。

He estimated the cost on the back of an envelope.

他在信封背面粗略地估算了成本。

In the movie 'The Right Stuff', test pilots frequently use the phrase to describe testing aircraft limits.

在电影《太空先锋》中，试飞员经常用这个短语来描述测试飞机的极限。

This is a classic line from the Academy Awards ceremony, said before revealing the winner.

这是奥斯卡颁奖典礼上的经典台词，在宣布获奖者之前说的。