这一点很重要，因为理论表明，当目标鱼种的生物量为其原始水平的50%左右时，渔场才能达到可收获的最大可持续产量。
That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.
他和他的团队发现，呼吸被污染的空气会使一个人的教育水平降低一年左右。
He and his team found that breathing polluted air can reduce a person's education level by about one year.
“在仅仅两个月的时间内，大米价格飞涨到接近历史水平，全球价格上涨了75%左右，”他说。
“In just two months, rice prices have skyrocketed to near historical levels, rising by around 75 percent globally,” he said.
其他一些人说可能会在8%左右——这是官方通常所谓的保持就业稳定的必要水平。
Several others say it could be around 8%-the level that officials often say is needed to keep employment stable.
或者可能这说明了我们的左右脑分泌了不同水平的多巴胺？
Or maybe this is a reflection of our left and right brains spitting out different levels of dopamine?
从数据上看，这次经济衰退只是使得生活水平回落到了2002年左右的水平上(见图表2)。
Numerically, the recession has sent living standards back only to the levels of around 2002 (see chart 2).
美联储目前认为，失业率将突破7%，有可能达到7.5%左右的高点——上一次达到这一水平是在1992年。
The Fed now thinks that unemployment will rise above 7 per cent and is likely to peak at about 7.5 per cent - a level last seen in 1992.
但在父亲肥胖的雌鼠身上，该基因的甲基化水平仅占对照组雌鼠的25%左右。
But in the daughters of obese fathers, the level of methylation of this gene was around 25% of the level seen in the control daughters.
他们每月到手的工资大约是200到240美元，而武汉居民的工资水平为160美元左右。
Their average monthly take-home pay is $200 to $240 -- compared with about $160 for all Wuhan residents.
军费开支占GDP的比例大约是1990年水平的一半左右。
Military expenditures as a percentage of global GDP are about half of their 1990 level.
到2020年左右，全球生育率将第一次低于全球生育等值替换水平。
By about 2020, the global fertility rate will dip below the global replacement rate for the first time.
到七月份为止，降雨量只达到平均水平的30%左右。
By the end of July, rainfall reached only around 30 percent of the average rate.
据中国互联网络信息中心统计，中国目前的互联网普及率仅为16%左右，而世界水平为19.1%，美国为69.7%。
For now, China has only about a 16% Internet penetration rate compared to the world standard 19.1% and the U.S. 's 69.7%, according to China Internet Network Information Center.
就现在的就业机会创造速度来看，还需要5年左右才能回到之前的水平。
At the current pace of job creation, it would take five years or so just to get back to those levels.
平均来说，将债务比例稳定在2012年的水平，仅需调整5%左右。
Stabilising debt ratios at 2012 levels would demand, on average, an adjustment only half as big.
据摩根·士丹利日本三菱部的费尔德曼先生称，自20世纪90年代以来，生产率就已每年1%左右的水平上升。
According to Mr Feldman at Morgan Stanley MUFG, since the 1990s productivity has been rising by an average of around 1% a year.
我在那里教的都是10岁左右的小孩，英语水平也都是刚入门。
I taught kids that were about 10, all of which were still beginning in English.
研究人员将两组老鼠在不同时段，当XPA达到最低水平，凌晨4点左右，和当XPA达到最高水品，下午4点左右，置于相同的紫外线照射下。
Researchers exposed mice to UV radiation when their XPA was at its minimum level, around 4 a.m., and others to the same rays around 4 p.m., when XPA levels peaked.
但自那以后，成交量就一直维持在今年早先正常水平的四分之三左右。
But volumes since then have been running at only about three-quarters of the norm from earlier in the year.
大量证据证明，个人的健康程度如何在很大程度上受到社会因素的左右，包括教育、就业状况、收入水平、性别和种族。
There is ample evidence that social factors, including education, employment status, income level, gender and ethnicity have a marked influence on how healthy a person is.
获准的购房抵押贷款数量大约是长期平均水平的一半左右。
The number of mortgages approved for house purchase is around half the long-run average.
根据国际货币基金组织等国际组织数据，中国人均GDP在世界排名第100位左右，不到世界平均水平的一半。
According to statistics from the IMF and other international organizations, China's per capita GDP ranks around 100th in the world, less than half of the world average.
市场现在预期在未来十年内的美国通胀水平会处于2%左右。
The markets are now expecting American inflation of around 2% over the next ten years.
他在一根垂直的针头顶点，设置了一根水平的钢制细棍，它可以左右转动，就像罗盘里的磁针那样。
On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box..
当潜在的通胀水平已经降到1%左右时，美国经济的复苏却面临财政刺激结束的不利局面；因此不能排除发生通缩的可能性。
America's recovery faces the headwind of expiring fiscal stimulus at a time when underlying inflation has already slipped to around 1%; outright deflation cannot be ruled out.
而天然气在消耗量中占了近4%，比世界平均水平低了五分之一左右。
While natural gas, accounts for nearly 4 percent of consumption, around a fifth lower than the world's average.
1990- 2008年，玉米产量上升1.8%左右，接近其长期平均水平，小麦产量增长不及玉米的一半，跟自己的历史平均水平相比增加了一半。
Maize yields in 1990-2008 rose by 1.8% a year, close to their long-term average; wheat yields increased by less than half that, half their historic average.
1990- 2008年，玉米产量上升1.8%左右，接近其长期平均水平，小麦产量增长不及玉米的一半，跟自己的历史平均水平相比增加了一半。
Maize yields in 1990-2008 rose by 1.8% a year, close to their long-term average; wheat yields increased by less than half that, half their historic average.
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