Airsickness is the name of that plane-motion feeling — the noun. If airsick is “I feel that way,” airsickness is “the thing that happens to you.” You take tablets for airsickness; a rough flight can cause airsickness; a notice might warn of airsickness.

Airsickness is the name of that plane-motion feelingAirsickness是那種因飛機晃動而不舒服的感覺的名稱——the noun是名詞。If airsick is “I feel that way,”如果airsick是「我覺得這樣」 airsickness is “the thing that happens to you.”airsickness就是「發生在你身上的那件事」。You take tablets for airsickness你會吃藥來應付airsickness; a rough flight can cause airsickness顛簸的飛行可能引發airsickness; a notice might warn of airsickness告示牌也可能警告乘客airsickness。

It is a little more formal than just saying you feel sick, because it names the condition, but families still use it in everyday talk.

It is a little more formal than just saying you feel sick它比單純說你不舒服稍微正式一點, because it names the condition因為它是在為這個狀況命名, but families still use it in everyday talk不過一般家庭在日常對話裡還是會用它。

Same idea as seasickness or carsickness.

Same idea as seasickness or carsickness跟seasickness（暈船）或carsickness（暈車）是同一個概念。

Though actually, on a long flight you can feel wretched for many reasons — pressure in the ears, bad food, fear — and people still dump them all under this word. Strictly, it is the motion.

Though actually不過其實, on a long flight you can feel wretched for many reasons長途飛行讓人不舒服的原因很多——pressure in the ears, bad food, fear耳壓、難吃的食物、害怕——and people still dump them all under this word但大家還是把這些全都歸到這個字底下。Strictly, it is the motion嚴格來說，它指的是動作、晃動本身。