natural mortality 中文意思是什麼
natural mortality
解釋
自然死亡率-
Mortality is the number or volume of trees periodically rendered unusable through natural causes.
枯損是一類由於自然原因而定期變得無用的林木株數或材積。 -
Although in recent years, china ' s population structure has changed into " three lows " complexion of low birth rate, low natural growth rate and low mortality rate thanks to china ' s unremitting efforts to carry out the family planning policy, a high growth is concomitant with the low birth rate
雖然近年來，由於計劃生育政策的持續不懈努力，中國人口結構已轉變成低出生率、低自然增長率、低死亡率的"三低"局面，但與低出生率相伴生的，卻是高增長量。 -
Green turtles normally have a very low survival rate due to predation and natural mortality and mature turtles only lay eggs every two to three years on the average
加上海龜通常每二至三年才繁殖一次，因此非法挖取海龜蛋對海龜種群會造成嚴重的傷害。 -
Children ' s corpses as earrings ( likeliest representing natural infant mortality and childhood mortality from causes such as disease ), and cobras as bracelets or garlands add to her terrifying adornments
兒童的屍體是耳飾（很可能是代表嬰兒的自然死亡率和由某些疾病引致的兒童死亡） ，眼鏡蛇是手鐲，加在她身上的花環是極大的裝飾品。 -
In chapter two, we study a ratio - dependent predator - prey system. we consider the death rate of predator as the natural mortality rate and the other death rate caused by the intraspecies competition or other factors, i. e., we consider the predator density dependence
對于捕食者的死亡率，我們不僅考慮了捕食者的自然死亡因素，而且還考慮了由於種內之間爭奪資源及其它原因引起的死亡等因素，即考慮捕食者之間密度制約因素。
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