极

jí extremely; pole (geography, physics); utmost; top

速

sù fast; rapid; quick; velocity

飞艇

fēi tǐng airship

有

yǒu to have; there is; there are; to exist; to be

哪些

nǎ xiē which ones?; who?; what?

技巧

jì qiǎo skill; technique

公式

gōng shì formula

《— 官方

guān fāng government; official (approved or issued by an authority)

指定

zhǐ dìng to appoint; to assign; to indicate clearly and with certainty; designated

:Y2Y·CC—》XBv