第17课：数字21到31.序列中的数字。 倍数10。

Lesson 17: Numbers 21 to 31. Numbers in Sequence. Multiples of 10.

二十一，第二十一次

Twenty-one, the twenty-first, 21st

二十二，第二十二次

Twenty-two, the twenty-second, 22nd

二十三，第二十三届

Twenty-three, the twenty-third, 23rd

二十四，第二十四

Twenty-four, the twenty-fourth, 24th

二十五，第二十五

Twenty-five, the twenty-fifth, 25th

二十六，第二十六

Twenty-six, the twenty-sixth, 26th

二十七，第二十七届

Twenty-seven, the twenty-seventh, 27th

二十八，第二十八届

Twenty-eight, the twenty-eighth, 28th

二十九，第二十九

Twenty-nine, the twenty-ninth, 29th

三十， 第三十

Thirty, the thirtieth, 30th

三十一，第31个

Thirty-one, the thirty-first, 31st

这是10和更大数字的倍数。 请注意，40拼写没有“u”。

Here are multiples of 10 and bigger numbers. Note that 40 is spelled without a "u".

四十，第四十

Forty, the fortieth, 40th

五十，第五十届

Fifty, the fiftieth, 50th

六十，第六十

Sixty, the sixtieth, 60th

七十，第七十

Seventy, the seventieth, 70th

八十，第八十届

Eighty, the eightieth, 80th

九十，第九十届

Ninety, the ninetieth, 90th

一百，百分之一

One hundred, the hundredth, 100th

一千，千分之一

One thousand, the thousandth, 1000th

一百万，百万分之一

One million, the millionth, 1000000th

一个月内的日期顺序示例。

Examples of date order within a month.

今天是星期二，即2月9日。

Today is Tuesday the ninth of February.

昨天是星期一的第八天。

Yesterday was Monday the eighth.

明天将是星期三的第十天。

Tomorrow will be Wednesday the tenth.

对于单日和日期，我们说“开”。

For single days and dates we say "on".

我出生在这个月的7号。

I was born on the 7th of the month.

我们的结婚纪念日是14日。

Our wedding anniversary was on the 14th.

几个月来我们说“在”。

For months we say "in".

我出生在十月。

I was born in October.

我的生日是10月11日。

My birthday is on October the 11th.

请问哪一天好吗？ 现在是星期二。

What day is it please? It's Tuesday.

请问几岁？ 这是四月二十二日。

What date is it please? It's the 22nd of April.

请问今天的日期是什么时候？ 这是七月十二日。

What's the date today please? It's the twelfth of July.

十年是连续的10年，也就是说，作为一个没有差距的区块。 1920 - 1929年间，1930 - 1939年被称为“二十年代”，“三十年代”等。 2000 - 2009年通常被称为“Noughties”。

A decade is 10 years, consecutive, that is, as a block with no gaps. The decades 1920-1929, 1930-1939 are called "the Twenties", "the Thirties" and so on. The decade 2000-2009 is often called "The Noughties".

从2007年到2016年，我们的人口越来越多。

The decade from 2007 to 2016 saw our population get fatter.

六十年代是冷战和太空竞赛的时代。

The Sixties was a time of the Cold War and the Space Race.

一个世纪是连续100年。

A century is 100 consecutive years.

工业革命始于十八世纪。

The Industrial Revolution started in the eighteenth century.

千年是一千年。

A millennium is one thousand years.

青铜器时代发生在公元前3千年。

The Bronze Age occurred during the 3rd Millennium BC.

澳大利亚（和英国）编写日期作为数字的方式是DAY / MONTH / YEAR，通常缩写为DD / MM / YY。 例如，2018年3月24日写为24/3/2018或24/03/2018。

The Australian (and British) way of writing a date as numbers is DAY/MONTH/YEAR, often abbreviated to DD/MM/YY. For example, the 24th of March 2018 is written as 24/3/2018, or 24/03/2018.

美国形式逆转了月和日：MM / DD / YYYY。 因此，2018年3月24日写成3/24/2018。

American form reverses the month and day: MM/DD/YYYY. So the 24th of March 2018 is written as 3/24/2018.

对于日期少于13的日期，这非常令人困惑。 2015年9月11日是9月11日还是11月9日？ 不知道形式，你不能确定！

For a date where the day is less than 13, this is very confusing. Is 11/09/2015 the 11th of September or the 9th of November? Without knowing the form, you cannot be sure!

最好完整地写日期，例如“2018年3月24日”或“2015年11月9日”。

It's better to write the date in full, for example "24 Mar 2018" or "November 9th, 2015".

最后在本课中，以下是澳大利亚人写小数的方式：

Finally in this lesson, here is the way that Australians write decimals:

一千一百二十三点八是2,123.8。 因此，使用全停止作为小数点，并使用逗号将数字分成三位数的组。

Two thousand one hundred and twenty-three point eight is 2,123.8. So a full-stop is used as a decimal point and a comma is used to separate numbers into groups of three digits.

这与大多数欧洲国家相反，人们写的是2.123,8。 但它与英国，新西兰和印度等前英国殖民地一样。

This is opposite to most European countries, in which people write 2.123,8. But it is the same as Britain, New Zealand and former British colonies such as India.