aquarium 鱼缸，水族馆 pl. aquaria
sluggish adj.缓慢的 >It is commonly found in still or sluggish waters.
creek (我们英语书对这个单词的解释极不准确)
      [US] a stream or narrow river <---学美式英语就要记住这个解释
      [UK] a narrow area of water that flows into the land from the sea, a lake, etc.
lighthouse 灯塔 (beacon也有灯塔的意思，但它还有其他意思)
dune 沙丘
vol'canic [-'kan-]
uncommercialized  >In general the atmosphere is quiet and uncommercialized.
brilliantly colored corals
Duckweed atop the pond
carpet-like
take over : get control
alga pl. algae 藻类
'noxious 有害的
sym'metrical
chrysanthemum
abloom (=in bloom)adj. Being in bloom;flowering > 2,000 chrysanthemums abloom at Conservatory Garden
bird's-eye view >A bird's eye view of Sheep Meadow
marathon ['ma-ra-thon] 马拉松 >Another New York Marathon ends in Central Park.
suggest  >Common Duckweed is a food source for many birds and fish,especially ducks as its name would suggest.
fish pl. fish or fishes
aquatic 水生的
reed 芦苇
oval-shaped 卵性的 >It has a round slightly oval-shaped body
'milli,meter 毫米
bloom >Common duckweed blooms in July and August
develop >The young develop in the lagoons.
content word 实义词
stem cell 干细胞
maple ['may-ple] 枫树
vine 藤本植物
coon informal. raccoon
moss 苔藓
lichen ['lie-ken]地衣
stamen 雄蕊
pistil [sound as pistol ]雌蕊
unisexual 单性的
'water,fowl 水鸟，水禽
bo'tanically
photosynthesis 光合作用
toxicity 毒性
aquaculture 水产养殖
micrograph 显微图/照片