fertility rate造句怎么写

Shanghai has had a fertility rate of less than 1.7 since 1975; in Guizhou, China's poorest province, the rate is 2.2.

The birth rate and natural growth rate decreased from 33.43‰ and 25.83‰ in 1970 to 15.23‰ and 8.77‰ in 1999 respectively. The total fertility rate went below the replacement level, making China one of the countries with a low fertility level in the wo

But with a population as large as China's and over a long time horizon, the consequences of small differences in the fertility rate are far reaching.

Many rural people have ignored the rules. And Thailand, by contrast, has achieved a sharper drop in its fertility rate over the same period without such tough measures.

Yet even if Rwanda's fertility rate falls below replacement level, as it's projected to do by 2050, its population will still triple beyond what it was before the 1994 genocide.

Conclusion: the short time incubation of oocytes and sperm is a simple and effective way in IVF-ET as it can promote the embryo quality and raise fertility rate.

Over the same period, the populations of OPEC countries started to mushroom, as both life expectancy and fertility rates rose.

There are four main parts. The first part reviews the existing studies on fertility rates both in China and abroad.

He says that both life expectancy and fertility rates have changed dramatically over the last 60 years, and further changes are expected.

The months in 2010 with the highest fertility rates –the number of children for every woman of childbearing age –were September, at 2.11; October, at 2.09; and November, at 2.03.

A fertility rate of 1.8 is still below replacement.

Of the 20 countries with the highest fertility rate, all but one are in the region.

If you adjust their lifetime fertility rate to take account of this bulge of babies on arrival, you find immigrant fertility is about 2.2, not much above average.

The country has the lowest fertility rate among developed nations with an average of 1.08 children per woman.

The CASS study calls for a "prompt" change of policy to get the fertility rate up to around the "replacement level" of 2.1.

The result indicated that ripe fish can strong physique by breeding in reinforcement, using oxytocic to make ripe fish grow synchronously, increase fertility rate of ripe fish, using slack water lo charge can increase the hatchabilily over95%.

Much of Europe and East Asia have fertility rates far below replacement levels.

In Hong Kong, for example, a cohort of 1, 000 women would be expected to give birth to just 547 daughters, at today's fertility rates.

The odd ones out are America and Britain, which both have lots of women at work and fertility rates close to replacement level (with immigration making up the rest).

Even Japan, famous for its dearth of children, has a higher fertility rate, at 1.3.

In France the fertility rate is already around two children per female, not far short of the “replacement rate” which keeps population numbers steady.

China's first census in 10, five-year one percent population sampling survey (called on the census), due to China's great population base, the determination of the total fertility rate is never easy.

In fact, fertility rates have dropped steeply in all OECD countries in the past few decades, from an average of 3.2 children per woman in 1960 to 1.6 now.

The fertility rate has risen to 1.66, still below the replacement level but higher than the national average.

Compared with America, even the growing parts of the continent have modest fertility rates and high dependency ratios.

The total fertility rate had been 5.8 in 1950, he notes, and had declined sharply to 2.3 by 1980, just above replacement level.

Though its fertility rate may have fallen recently, it is still slightly higher than Europe’s.