revealed 显示出了，揭露了

faint 微弱的；不清晰的

etchings 蚀刻图案

astrolabe 星盘（天文测量仪器）

mariners 水手

horizon 地平线

dates 推算出制造时间

测验 请听报道并回答下列问题。

1. How was the slim bronze disc discovered?

2. True or false: Faint etchings can be easily seen with the naked eye around the disc’s edges.

3. What is an astrolabe used for?

4. True or false: Around one hundred of these items have been found, and all of them are the earliest known astrolabes.

答案 1. How was the slim bronze disc discovered?

The slim bronze disc was discovered during the excavation of the Esmeralda shipwreck – a Portuguese vessel that was exploring the Indian Ocean when it sank in a storm in 1503.

2. True or false: Faint etchings can be easily seen with the naked eye around the disc’s edges.

False. According to the article, it was laser scanning that revealed faint etchings around its edges, each separated by five degrees.

3. What is an astrolabe used for?

The astrolabe is an instrument used by mariners to measure the height of the sun above the horizon, enabling them to navigate the seas.

4. True or false: Around one hundred of these items have been found, and all of them are the earliest known astrolabes.

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