one thousand five hundred數(shù)字表示可以從右到左三位三位一個逗號，第一個逗號是thousand（千），第二個是million（百萬）,第三個是billion（十億）,三位數(shù)字就按照百位讀即可。eg 5,132 讀作five thousand one hundred and thirty-two 21,094讀作twenty-one thousand and ninety-four 12,420,864讀作twelve million four hundred and twenty thousand eighty hundred and sixty-four 123,423,998,010讀作one hundred and twenty-three billion four hundred and twenty-three million nine hundred and ninety-eight thousand and ten

He participated in distance running 1500 meters.

ometimes I have thought it woul

這個不好說，但是一般情況下會要比這1500多漢字要多。比如說聯(lián)合國的會議記錄永遠是用中文寫的那個文件最薄。

15 million (fifteen milion)

hybrid sterility雜種不育性macroevolution宏觀進化，種外進化microevolution微進化，種內(nèi)進化parallel evolution平行進化phylogeny種系發(fā)生，系統(tǒng)發(fā)生，系統(tǒng)發(fā)育punctuatedequilibrium間斷平衡sympatricspeciation同域物種形成，同地物種形成，分布區(qū)重疊物種形成

( There ) are ( at) ( least) 1500 students in our class.

老師約150人學(xué)生1500人about one hundred and fifty teachers, one thousand five hundred students

fifteenthousandand two point eight eight