话题：
the diagram below shows the life cycle of a salmon,from egg to adult fish.
下图显示了鲑鱼从卵到成鱼的生命周期。
范文推荐：
The diagram illustrates the stages in the life of the salmon, from birth to maturity.
It is clear that there are six* main stages as the salmon develops from egg to mature adult. We can also see that salmon spend time in three distinct locations during the cycle, moving from river to estuary to ocean and then back upstream.
Salmon begin their lives in rivers where the adult fish lay and incubate their eggs. After emerging from eggs, the young salmon spend the next stage of their lives being reared in freshwater areas. Then, at some point in their development, the fish swim downstream to river estuaries where rearing continues.
Following the estuary rearing period, the maturing salmon migrate to the ocean, where they eventually become fully grown adults. Finally, the adult fish travel back upstream to spawning areas of rivers; here they reproduce and lay their eggs, and the life cycle begins anew.
重难点词汇学习：
maturity
释义
n.成熟; 完备; （票据等的）到期; [地]壮年期;
He has maturity beyond his years.
他过于老成。
His behaviour spoke of an early maturity.
他的举止流露出早熟的痕迹。
We stop growing at maturity.
我们成年之后不再长个儿。
locations
释义
n.位置，场所( location的名词复数 ); 发现[找出]…的位置[地点]; 外景（拍摄地）;
The exact locations are being kept secret for reasons of security.
确切地点因为安全原因要保密。
Her company has had to split up and work from two locations.
她的公司不得不被拆开，分在两处办公。
As a photographer, he'd found both locations just a trifle disappointing.
作为摄影师，他感到两处景点都有点儿不尽如人意。
rearing
释义
v.饲养( rear的现在分词 ); 养育; 抚养; 抬起;
n.抚养；养育；培养,饲养;
There are positive changes that should be implemented in the rearing of animals.
应该对动物饲养进行明确的改革。
He curbed it, I think, as a resolute rider would curb a rearing steed.
我想, 他还是管住了它, 就象一个果断的骑师管住一匹用后腿站立起来的骏马.
The development cycle and artificial rearing of Holotrichia parallcla in peanut field was studied preliminary.
本文对花生田暗黑鳃金龟的室内生活史及人工饲养条件进行了初步研究.
salmon
释义
n.鲑鱼; 鲑鱼肉; 大马哈鱼; 三文鱼;
大小写变形:Salmon
wild and farmed salmon
野生和人工养殖的鲑鱼
Poachers have been netting salmon to supply the black market.
盗猎者一直在捕捞大麻哈鱼到黑市上去卖。
The results prove that regulation of the salmon farming industry is inadequate.
结果证明对鲑鱼饲养行业的管理不够完善。
