A hydrofoil is a boat with wing-shaped pieces under it, down in the water. When the boat is still or slow, it sits in the water like any other boat.

A hydrofoil is a boat with wing-shaped pieces under it, down in the waterHydrofoil 是一種船底裝著翼形構件、沉在水裡的船。When the boat is still or slow船靜止或慢速時，it sits in the water like any other boat它就像一般的船一樣浮在水面上。

When it goes fast, those wings push against the water and lift the body of the boat up, so most of it is riding above the surface. Less of the boat is dragging through the water, so it can go very quickly and often more smoothly.

When it goes fast當船加速時，those wings push against the water and lift the body of the boat up那些翼片會頂住水，把船身往上抬，so most of it is riding above the surface讓船大部分的部位騎在水面之上。Less of the boat is dragging through the water船身接觸水面的部分變少了，so it can go very quickly and often more smoothly所以能開得非常快，通常也更平穩。

People also call the wing itself a hydrofoil; the boat is named after that part. You will hear the word in engineering, ferry travel, and, more and more, in sport — riders now put a small hydrofoil under a board and fly over the water.

People also call the wing itself a hydrofoil人們也會把那個翼片本身叫做 hydrofoil；the boat is named after that part這種船就是以那個部件命名的。You will hear the word in engineering, ferry travel, and, more and more, in sport你會在工程領域、渡輪業，還有越來越多在運動場合聽到這個詞——riders now put a small hydrofoil under a board and fly over the water現在的玩家會在板子下裝一片小 hydrofoil，飛在水面上滑行。

It is a technical word, not something you say at the dinner table. Though actually, the “foil” here is not kitchen foil. It is the same idea as the wing of a plane, only working in water.

It is a technical word這是個技術性的詞，not something you say at the dinner table不是餐桌上會說的話。Though actually, the "foil" here is not kitchen foil不過話說回來，這裡的 "foil" 不是廚房用的鋁箔。It is the same idea as the wing of a plane它跟飛機機翼是同一個概念，only working in water只是換成在水裡運作。