1
there is a dragonfly + place
there is 用于存现句，主语为单数可数名词 dragonfly，注意用不定冠词 a。
There is a dragonfly on the window.
窗户上有一只蜻蜓。
蜻蜓
先理解核心含义，再看它在真实句子里的用法。
蜻蜓
a non-stinging insect with a slender body and iridescent wings that are spread out when at rest; both adults and young feed on mosquitoes and other small insects.
There is a dragonfly on the window.
窗户上有一只蜻蜓。
An insect of the suborder Epiprocta or, more strictly, the infraorder Anisoptera, having four long transparent wings held perpendicular to a long body when perched.
体型纤细的不蜇人的昆虫,具有虹彩翅膀,休息时翅膀展开；成虫和幼虫以蚊子等为食
slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.
A dragonfly flew past my window this morning.
今天早上有一只蜻蜓从我窗前飞过。
In summer, children like to watch dragonflies near the river.
夏天，孩子们喜欢在河边看蜻蜓。
I noticed a blue dragonfly resting on a stone by the path.
我注意到一只蓝色蜻蜓停在路边的一块石头上。
there is 用于存现句，主语为单数可数名词 dragonfly，注意用不定冠词 a。
There is a dragonfly on the window.
窗户上有一只蜻蜓。
watch 后接宾语和省略 to 的不定式，表示观察动作的全过程。
We watched a dragonfly land on the leaf.
我们看着一只蜻蜓落在叶子上。
dragonfly 的复数是 dragonflies；作主语时谓语动词用复数形式（如 feed）。
Dragonflies feed on mosquitoes.
蜻蜓以蚊子为食。
Not this
It is a dragon fly.
Use this
It is a dragonfly.
dragonfly 是固定复合名词，必须连写成单个单词；分开写 dragon fly 不是正确拼写，也会改变意思。
Not this
There are many dragonfly in the park.
Use this
There are many dragonflies in the park.
many 后接可数名词复数，dragonfly 的复数形式为辅音字母加 y 变 i 再加 es，即 dragonflies，不能用单数形式。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
蜻蜓若虫
The dragonfly nymph lives in water for months before emerging as an adult.
蜻蜓若虫在水中生活数月，然后羽化为成虫。
蜻蜓翅膀
The dragonfly wings shimmer with iridescent colors in the sunlight.
蜻蜓翅膀在阳光下闪烁着彩虹般的颜色。
蜻蜓物种
This wetland is home to many dragonfly species.
这片湿地是许多蜻蜓物种的栖息地。
蜻蜓飞行
Dragonfly flight is remarkably agile and fast.
蜻蜓飞行异常敏捷和迅速。
蜻蜓栖息地
Clean water is essential for dragonfly habitat.
干净的水对蜻蜓栖息地至关重要。
小荷才露尖尖角，早有蜻蜓立上头。
A famous couplet from Yang Wanli's poem 'Little Pond' (《小池》), often quoted to depict the delicate beauty of spring; here the dragonfly and lotus bud capture a moment of stillness.
这是杨万里《小池》中的名句，常被引用描写春天细腻的美好，蜻蜓与荷苞定格了宁静的一刻。
我尽力去留意，当蜻蜓出来飞舞的时候。
This lyric from The Killers' hit single 'Human' (2008) uses the dragonfly as a symbol of life's fleeting beauty and the need to pay attention.
这首《Human》是杀手乐队2008年的热门单曲，歌词用蜻蜓象征生命中短暂的美丽，提醒人们用心留意。
Use dragonfly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象蜻蜓是“会飞的龙”：dragon（龙）+fly（飞），合起来就是蜻蜓。
语域：neutral 常见场景：自然观察、儿童读物、日常对话 该词是中性常用词，日常描述或科普语境中都比较常见，正式与非正式场合均可使用。
All six words end in -fly and are pronounced with final /ˌflaɪ/, so they rhyme with dragonfly. Note that 'dragon' alone is /ˈdræɡən/ and does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.