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【根】aqua,aque,aqui=water 水
记忆小窍门：liquid-iqui

aqua
Water.
An aqueous solution.
A light bluish green to light greenish blue.
n. 水；溶液；浅绿色
adj. 浅绿色的

aqueous
Relating to, similar to, containing, or dissolved in water; watery.
Geology. Formed from matter deposited by water, as certain sedimentary rocks.
adj. 水的，水般的

aquarium
A tank, bowl, or other water-filled enclosure in which living fish or other aquatic animals and plants are kept.
A place for the public exhibition of live aquatic animals and plants.
n. 水族馆；养鱼池；玻璃缸

aquamarine
A transparent blue-green variety of beryl, used as a gemstone.
A pale blue to light greenish blue.
n. [宝] 海蓝宝石；碧绿色，浅绿色

aquatic
Consisting of, relating to, or being in water: an aquatic environment.
Living or growing in, on, or near the water: aquatic animals and plants.
Taking place in or on the water: an aquatic sport.
An organism that lives in, on, or near the water.
aquatics Sports. Athletic activities performed in or on the water.
adj. 水生的；水栖的；在水中或水面进行的
n. 水上运动；水生植物或动物

例句：
We visited an aquatic city in Italy.
我们在意大利访问过一个水上城市。

aqueduct
A pipe or channel designed to transport water from a remote source, usually by gravity. A bridgelike structure supporting a conduit or canal passing over a river or low ground.
n. [水利] 渡槽；导水管；沟渠

opaque
Impenetrable by light; neither transparent nor translucent. Not reflecting light; having no luster: an opaque finish.
Impenetrable by a form of radiant energy other than visible light: a chemical solution opaque to x-rays.
So obscure as to be unintelligible: “opaque, elusive, minimal meanings” (John Simon). Obtuse of mind; dense. See Synonyms at dark.
Something that is opaque, especially an opaque pigment used to darken parts of a photographic print or negative.
adj. 不透明的；不传热的；迟钝的
n. 不透明物
vt. 使不透明；使不反光

例句：
The once clear mountain stream is now polluted and opaque.
曾经是很清澈的山溪, 现在受到污染变得混浊了。
The report was written in long, opaque sentences.
报告中的句子又长又难懂。

Aquarius
A constellation in the equatorial region of the Southern Hemisphere near Pisces and Aquila.
The 11th sign of the zodiac in astrology. One who is born under this sign.
n. 宝瓶（星）座；宝瓶宫