A primitive wind instrument consisting of a series of pipes or reeds of graduated length bound together, played by blowing across the top open ends. Often used in the plural.

排箫由一系列管或长短不一的芦笛组成的原始管乐器，通过对其顶部的开口吹气进行吹奏。

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The top can be worn buttoned up or open over a T-shirt.

这件上衣可以系上扣子或不系扣子套在T恤衫的外面穿。

《柯林斯英汉双解大词典》

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They were in the open at the top of the fort, where there was no protection for the gunners.

VOA: special.2009.08.13

The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.

顶部盖了盖子的热水瓶，不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。

麻省理工公开课 - 热力学与动力学课程节选

You see that in the top picture. And within those precincts, within that enclosure, there's a large, open courtyard.

你们可以在顶上的图中看到，在界域里面，它的内部，有一片巨大空旷的庭院。

耶鲁公开课 - 旧约导论课程节选

One other neat trick: We drove with the top wide open while it was drizzling, and as long as we kept our speeds above 40 mph, the rain never touched us.

FORBES: Overview

The new law, which applies to both ball carriers and defenders, will penalize players who drop their heads and deliver a forcible blow with the top of the helmet in the open field.

WSJ: NFL Owners Pass Helmet-Hit Rule

Porto had shown some threat on the break, but the real danger was coming from Arsenal and Arshavin should have tightened their grip on the game 12 minutes before half-time, only to fire carelessly over the top of an open goal after fine work by Nasri.

BBC: Arsenal 5-0 Porto (6-2)