The first definition has no arguments, hence the empty square brackets.

第一个定义没有参数，因此方括号是空的。

youdao

It was raining harder. A man in a rubber cape was crossing the empty square to the cafe.

一个穿着橡胶披风的男人正穿过空荡荡的广场到咖啡店去。

youdao

Tap the square horizontally or vertically adjacent to the empty square to move the pieces till you get the original image.

点击空位四周的图块就可以将其移动到空位上，直至把整幅图片复原。

youdao

Essex-born Mark Wallinger is best known for his sculpture for the empty fourth plinth in Trafalgar Square.

BBC: Tracey Emin to appear at festival

He drove down an empty Piccadilly, crossed Trafalgar Square in silence, and parked outside the unguarded Buckingham Palace.

NEWYORKER: The Autobiography of J.G.B.

The work is presented on the empty Fourth Plinth of Trafalgar Square and is a wry response to a square that is dominated by a male, disabled figure.

BBC: NEWS | Programmes | Newsnight | Newsnight Review | Marc Quinn