ceiling

天井

部屋の内側の、一番上にある面。

やさしい英語で： The inside surface at the top of a room.

• The ceiling is white.
• A lamp hangs from the ceiling.
• These old rooms have very high ceilings.

よく使う表現： high ceiling, ceiling fan, on the ceiling

上限

許される、または到達できる最大の量や水準。

やさしい英語で： The highest amount or level that is allowed or possible.

• The government introduced a price ceiling.
• There is a ceiling on annual spending.
• They raised the debt ceiling again.

使い方： a ceiling on something (The council set a ceiling on rent increases.)

類義語： upper limit, maximum, cap

反対語： floor

よく使う表現： price ceiling, debt ceiling, ceiling on something

上昇限度

航空機が安全に飛び続けられる最大の高度。

やさしい英語で： The greatest height at which an aircraft can safely keep flying.

• The aircraft has a high service ceiling.
• Its ceiling is lower when it carries heavy cargo.
• The pilot kept well below the helicopter’s ceiling.

類義語： maximum altitude

よく使う表現： service ceiling, operational ceiling, aircraft ceiling

天井関数、切り上げ値

ある数以上の整数のうち、最も小さいもの。

やさしい英語で： The nearest whole number that is equal to or greater than a given number.

• The ceiling of 2.3 is 3.
• For whole numbers, the ceiling equals the original value.
• Use the ceiling function to round this value up.

反対語： floor

よく使う表現： ceiling function, ceiling of something

雲底高度

空の大部分か全体を覆う、最も低い雲の層の底の高さ。

やさしい英語で： The height of the lowest cloud layer that covers most or all of the sky.

• The airport reported a low ceiling.
• The cloud ceiling fell during the afternoon.
• Poor visibility and a low ceiling delayed our flight.

類義語： cloud base

よく使う表現： low ceiling, cloud ceiling, ceiling and visibility