うるう秒 (leap second)

Leap second added to clocks at midnight Saturday

A leap second was added to clocks at the end of the day on Saturday, making the day one second longer than usual
because tides are causing the Earth's rotation to gradually slow down.



＜重要語句＞

leap second：うるう秒

tide（名詞）：潮流

rotation（名詞）：回転、自転

gradually（副詞）：徐々に