annual death rate 中文意思是什麼
annual death rate
解釋
年死亡率-
The annual yield of grass carp covers 20 % in total output of the fresh water fish, which is fast growing and tastes delicious, besides, the forages of grass carp are various, with a lower cost of raising, however, at present, the serious diseaes of grass carp results in a lower survival rate 10 - 15 %, which cause more then billions yuan economic losses per year to the fresh water cultiuation, especially, hemorrhagic virus of carp lasts for a long period of time and features a high death rate, therefore, it " s a woed - wide problem for the aquacultural scientific researchers to discover an effective settlement, which is still under the discussion
其生長快、飼料來源廣、飼養成本低和肉味鮮美。但草魚病害多,危害嚴重,目前草魚由苗種養至成魚的成活率僅為10 - 15 ,每年給我國淡水養殖業造成數億元經濟損失。特別是病毒性的草魚出血病,流行季節長,發病死亡率高,因此,對草魚出血病的有效防治一直是世界各國水產科學工作者艱苦探索而又未能找到理想解決辦法的世界性難題。 -
1. the age - standardized death rate is compiled based on the world standard population published in the 1997 - 99 world health statistics annual
1 .年標準化死亡率是根據一九九七年至一九九九年世界生統計年報刊載的標準世界人口編制。 -
The annual death rate in the united states is 11 per 1000, whereas that of latin america is 23 per 1000
美國的人口年死亡率為千分之十一,而拉丁美洲的則高達千分之二十三。
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