A sunspot is a dark patch on the surface of the sun.

A sunspot太陽黑子 is是 on the surface of the sun在太陽表面上的 a dark patch一塊暗斑。

It looks dark only by comparison — it is still fiercely hot, just cooler than everything around it, because the sun's magnetic field is twisted up at that point and slows the heat rising from below.

It它 looks dark看起來暗 only by comparison只是相對而言 — it is still fiercely hot它其實還是非常熱，just cooler than everything around it只是比周圍的東西涼一點，because因為 the sun's magnetic field太陽的磁場 is twisted up at that point在那個地方扭結在一起 and而且 slows the heat rising from below讓從下面升上來的熱變慢。

Sunspots come and go, and their number rises and falls in a cycle of about eleven years; when there are many, the sun throws out more storms of particles, which can disturb radio signals and satellites and give us bright auroras near the poles. Astronomers count them, so you will hear 'sunspot number' and 'sunspot cycle' in science writing.

Sunspots太陽黑子 come and go會出現又消失，and而且 their number rises and falls它們的數量會起伏 in a cycle of about eleven years以大約十一年為一個週期；when there are many當數量多的時候，the sun throws out more storms of particles太陽會噴發出更多的粒子風暴，which可以 disturb radio signals and satellites干擾無線電訊號和衛星 and give us bright auroras near the poles並在極區帶來明亮的極光。Astronomers天文學家 count them會計算它們的數量，so所以 you will hear你會聽到 'sunspot number' and 'sunspot cycle''sunspot number'太陽黑子數和'sunspot cycle'太陽黑子週期這兩個說法 in science writing在科學寫作裡。

It is a countable noun: one sunspot, many sunspots. In holiday advertisements you may also see 'sunspot' used loosely to mean a sunny place to go on holiday, and doctors sometimes call the small brown marks that come from years of sunshine sunspots too — but the astronomy meaning is the main one, and the one being explained here.

It它 is是 a countable noun可數名詞：one sunspot, many sunspots像one sunspot、many sunspots這樣變化。In holiday advertisements在度假廣告裡 you may also see你也可能看到 'sunspot' used loosely'sunspot'被鬆散地用來 to mean a sunny place to go on holiday指一個適合去度假的陽光勝地，and而 doctors醫生 sometimes call the small brown marks that come from years of sunshine sunspots too有時候也把曬了多年太陽長出來的小棕斑叫做sunspots——but但 the astronomy meaning is the main one天文學上的意思才是主要的意思，and the one being explained here也就是這裡在解釋的意思。