起落的英文：
rise and fall
up and down
lift

参考例句：

(of aircraft) short take-off and landing
(指飞机)短距起落

a retractable landing wheel gear ]
伸缩起落轮架

aircraft in the pattern
起落航线上的飞机

traffic pattern altitude
起落航线高度

vertical and short take - off and landing airplane
垂直和短距起落飞机

There has been a mechanical malfunction with the landing gear.
飞机的起落架有机械方面的故障。

Reeking with an odor so rich that they were both outside retching violently against the landing gear
他们闻到一股强烈的气味，以致两人不得不跑出外面，伏在起落架上呕吐不止。

Most of the aircraft consists of five main components: wings, fuselage, tail, landing gear and power plant.
大多数飞机由五个主要部分组成：机翼、机身、尾翼、起落装置和动力装置。

They rise or squat suddenly, or jump while spinning.
忽而跃起、蹲落，拧身旋转而起，如鹰隼起落扶摇直上。

"Singapore is deeply affected by the US, such as the ups and downs in the American economy and stock market."
新加坡深受美国影响，美国经济和股市的起落，我们马上能感受到其冲击。

rise是什么意思：
n. 上升，升起；出现，兴起；增加；增长；高地
v. 上升；增强，增加；起立；起床；高耸；使…飞起；使…浮上水面；复活；发酵

to erect; to rise
竖立

Prices are on the rise.
价格在上涨。

To rise with the crow of cocks—assiduity and early rising
鸡鸣而起

fall是什么意思：
v. 落下；倒塌；摔倒；下降；减弱；阵亡
n. 摔倒；下降；秋天；垮台；陷落；瀑布
adj. 秋天的

Sleet is falling.
天上下起了冰雹。

fall into disfavour
失宠失众望

We observed the barometer fall. [The barometer was observed to fall.]
我们看见晴雨表下降。

down是什么意思：
prep. 在…下，沿着
v. 下降，打倒
n. 潦倒；羽绒；丘陵

Down with hegemonism!
打倒霸权主义！

The sun is down.
太阳下山了。

Close down autos and you close down steel and rubber.
关掉了汽车工业你也就关掉了钢铁工业和橡胶工业。