Its numbers fall tenfold to thirty in a typical cycle, and a hundredfold change can occur.
在一个典型的循环中，其数量会以十倍到三十倍减少，甚至会出现一百倍的变化。
About nine-thirty in the morning.
大约早上九点半吧。
他们总共有三十人。
Today is Friday. I get up at six thirty in the morning.
今天是星期五。我早上起床在六点三十。
I usually do my homework at around six-thirty in the evening.
我通常在晚上六点半左右做家庭作业。
Mr Wang: We're going to leave home at eleven thirty in the morning.
王先生：我们要在早上11点30分离家。
It's three thirty in the afternoon at Raynham Primary School in London.
现在是在伦敦雷纳姆小学，下午3点半。
Then Samuel brought Saul and his servant into the hall and seated them at the head of those who were invited--about thirty in number.
撒母耳领扫罗和他仆人进了客堂，使他们在请来的客中坐首位。 客约有三十个人。
Around one thirty in the morning, the planchette suddenly froze in Mary's hand. It wouldn't move, no matter how much we pushed and pulled.
大概凌晨1点30分，占写板突然在玛丽的手中停住了，无论我们怎么推拉，都不动。
He trapped Chuck in a corner and pummelled him ferociously for thirty seconds.
他把查克堵到一个角落，然后用拳残忍地猛击了他三十秒。
Thirty engineers were working as a team in a company.
30名工程师组成一个团队在一家公司工作。
Thirty years later, a woman approached me in a public place.
三十年后，一个女人在公共场合走近我。
You should give yourself at least thirty minutes in all for reading every day.
你每天总共应该给自己至少三十分钟的阅读时间。
In the past thirty years many social changes have taken place in Britain.
在过去的三十年里，英国发生了许多社会变化。
Only thirty students graduated in Chinese last year.
去年只有三十名学生获得汉语学士学位。
I saw a man in a blue jacket thirty yards ahead of me.
我看见在我前面30码处有一个穿蓝色夹克的男人。
In thirty years from now the United States should have a manned spacecraft on Mars.
从现在开始30年内，美国会把载人航天器送上火星。
She's in her mid-thirties—thirty-six to be exact.
她三十五岁左右—确切地说是三十六岁。
We'll reassemble in the parking lot in thirty minutes.
30分钟后，我们将在停车场再一次集合。
Put the onions and ginger in the oven and let them roast for thirty minutes.
把洋葱与生姜放入烤箱中烤30分钟。
There are about thirty-one million blacks in the U.S.
美国大约有三千一百万黑人。
Denver and Ruby are two of the thirty-fourth therapy horses brought in from a local farm.
丹佛和鲁比是从当地农场引进的三十四匹“理疗马”中的两匹。
Soldiers were expected to be able to travel thirty kilometers per day, in full pack.
士兵们预计每天在全副武装的情况下行进30公里。
In Beijing, Master Li Yu is teaching Shaolin Kung fu to thirty young students, three of whom come from abroad.
在北京，大师李玉正在教30名年轻学生少林功夫，其中三人来自国外。
There is a flight to Lenarty Airport which leaves at six thirty London time and gets in at eight thirty Italian time.
有一架飞往莱纳蒂机场的航班，于伦敦时间6：30起飞，意大利时间8：30到达。
She lived in a hostel with thirty other girls ( "Always in the stink of women!").
她与另外三十个女孩住在一家招待所（“尽是女人的臭味”）。
You think your product will appeal most to teachers ages twenty to thirty, so you decide to put your advertisement in their favorite magazine, the one about classroom activities.
你认为你的产品最能吸引20到30岁的老师，所以你决定把你的广告放在他们最喜欢的杂志上，那本关于课堂活动的杂志。
The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.
棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。
So far in the Paris region, there's been a forty-six percent decline in Japanese visitors, thirty-five percent fewer Russians and twenty-seven percent fewer Italians.
到目前为止，巴黎地区的日本游客减少了46%，俄罗斯游客减少了35%，意大利游客减少了27%。
So far in the Paris region, there's been a forty-six percent decline in Japanese visitors, thirty-five percent fewer Russians and twenty-seven percent fewer Italians.
到目前为止，巴黎地区的日本游客减少了46%，俄罗斯游客减少了35%，意大利游客减少了27%。
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