We have a package of thirty-six air-mail stamps.

Air-mail to China is two dollars a half-ounce.

往中国寄东西的航空邮价是每半盎司两美元.

I need some air-mail stamps.

我要买些航空邮票.

I'd like to send this by air mail, please.

我想要用航空邮寄这个, 麻烦你.

Are these stamps also good for air-mail going out of the country?

这些邮票也可以用来往国外寄信 吗 ?

Do you happen to know the air-mail rate to China?

请问往中国寄东西的航空邮价是 多少 ?

How much does it cost by air mail?

空运多少钱?

I sent a letter by air mail.

我寄出一封航空信.

Please buy some air mail stamps for me.

请给我买几张航空邮票.

Send the parcel by air mail, please.

请用航空邮件寄包裹.

Air mail is quicker than sea mail.

航空邮寄比海上邮寄快.

He was an Air Marshal before retirement.

他退休前是空军中将.

Air Marshal Gordon Black

空军中将戈登∙布莱克

Therefore, outlet air temperature tends to decrease as air mass flow rate increases.

因此, 流出气流的温度呈现出随气流量的增加而降低的趋势.

However, increase of heat transfer rate is less than of air mass flow rate.

但是, 增加的传热率小于空气质量流量.

Thunderstorm form when a warm air mass is forced by a cold mass at a front.

当暖气团在锋面处受到冷气团的作用时,就会形成雷暴雨.

However, increase of heat transfer rate is less than that of air mass flow rate.

然而, 传热率的增加幅度要低于气流量的增加量.

By the Siberian winter cold air mass control, the prevalence of northerly winds, cold climate.

冬季受西伯利亚冷气团控制, 盛行偏北大风, 气候寒冷.

The relational expression between material transmit mass and fluidized air mass was obtained also.

试验还得到了物料输送量与流化空气量的关系式.

An air mass rises for a number of reasons.

由于多种原因,一股气团已经生成.

Higher heat transfer rate as air mass flow rate increases.

高等传热利率空气质量流量的增加.