How much does it cost by air mail?

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.

The products of combustion and of industrial processing are contained with a confined air mass.

燃烧和工业过程产物被封闭在局部气团的地区中.

The major controlling influence is the inflow of a cold , dry, air mass.

主要支配的影响是干冷气团之流入.

Recycle your old mobile phone and get up to 750 air miles in exchange.

回收你的旧手机,可以兑换高达750英里航空线.

Now where can I get some air miles again?

现在我还能在哪里得到航空里程 呢 ?

The 13-month-old has now clocked up 16,000 air miles since leaving Malawi.

这个13个月大的小不点从离开马拉维开始,已经飞行长达16,000英里.

The linear rollback method is perhaps the simplest one based directly on air monitoring data.

线性压值法也许是直接根据监测资料所得到的最简单的方法.