constantly是一個副詞，表示持續不斷地，在句中通常修飾動詞，副詞，形容詞和句子，做狀語。

1.Language is constantly and gradually evolving.語言在不斷地緩慢發展。

2.The reason why the ponies here are naughty is that Haytor is a tourist-heavy area and tourists are constantly feeding the ponies foods, despite sighs asking them not to.這裡的小馬之所以淘氣,是因為海託是旅遊重鎮,遊客們不斷地給小馬餵食,儘管有人嘆著氣要求他們不要。

3.He constantly feels he has to prove himself to others.他時常覺得自己必須向人一展身手。

詞義表達和用法不同：

雖然兩個詞在詞典中都有不間斷連續的解釋，但是continuously表示短時間內不間斷，而且這種不間斷並非比喻意上的。

而constantly強調經常，即使可以翻譯成“不間斷”，也是想說經常到好像不間斷的這樣一個程度，而且constantly可以用在長期的情況。

擴充套件資料：

一、continually用法：

1、例句：

The rules and regulations of the factory are continually being improved.

廠裡的規章制度日趨完善。

2、用法一：不停的;不間斷的 

A continual process or situation happens or exists without stopping.

The school has been in continual use since 1883...

自1883年以來，該校從未停辦過。

3、用法二：一再的;反覆的;頻繁的

Continual events happen again and again.

...the government's continual demands for cash to finance its chronic deficit...

政府為補貼長期的財政赤字而對資金的持續需求。

二、constantly用法：

1、We must constantly adjust the amount of money in circulation.

我們必須對貨幣的流通不斷進行調節。

2、持續不斷的;重複的;一直存在的

You use constant to describe something that happens all the time or is always there.

She suggests that women are under constant pressure to be abnormally thin...

她暗示說女性總是處在保持身材異常瘦削的壓力之下。

3、恆定的;不變的

If an amount or level is constant, it stays the same over a particular period of time.

The average speed of the winds remained constant.

平均風速保持穩定。

3、恆定物;常數；常量；常項

A constant is a thing or value that always stays the same.

In the world of fashion it sometimes seems that the only constant is ceaseless change...

在時裝界，有時似乎唯一永恆不變的東西就是不斷的變化