The researchers captured 18 nestlings and then hand and observed them for two years.是什么意思？

The researchers captured 18 nestlings and then hand and observed them for two years.

研究小组捕捉了18只未离巢的雏鸟,并亲自孵育它们,观察它们两年.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

researchers

n. 研究员，调查者( researcher的名词复数 )；

例句
I was impressed by the high calibre of the researchers and analysts...
研究人员和分析人员的高素质给我留下了深刻印象。

captured

v. 俘获( capture的过去式和过去分词 )，夺取，夺得，引起（注意、想像、兴趣）；

例句
He based his conclusions on the evidence given by the captured prisoners.
他根据被俘囚犯提供的证据得出了这个结论。

nestlings

N-COUNT 雏鸟;幼鸟；

例句
Artificial incubation and growth observation for the nestlings of Great Bustard ( Otis tarda )
大鸨人工育雏及雏鸟生长发育的研究 ( 英文 )

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

then

adv. 那时，然后，那么，话说回来；adj. 当时的，那时的；

例句
Liz adjusted her mirror and then edged the car out of its parking bay.
莉兹调了调后视镜，将车子挪出了停车位。

hand

n. 手，协助，帮助，（工具等的）把，柄，掌管；vt. 传递，交给，搀扶，支持；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

observed

v. 观察，研究( observe的过去式和过去分词 )，遵守，（尤指为科学目的的）观察，看到；

例句
In China Grace Thompson observed the great variety of loads that were carried by 'slim, erect but muscular Amazons'.
在中国，格雷丝·汤普森看见“苗条、挺直而强健的女人们”携带着各种物品。

them

pron. 他们，她们，它们；

例句
I take care of them to the best of my abilities...
我尽我所能地照顾他们。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。