英语翻译TRIANGULAR NUMBER1,3,6,10,15,21,28,36,45,.this sequence

TRIANGULAR NUMBER 三角数
1,3,6,10,15,21,28,36,45,.
this sequence is generated from a patterm of dots which form a triangle. by adding another row of dots and counting all the dots we can find the next number of the sequence.
该数列由可以形成三角形的一系列点组成.按规律再添加下一行点,则之前所有点和该行点数之和为数列中下一个元素.

1 = 1
3 = 1+2
6 = 1+2+3
.
第一行一个点,第二行2个点,第三行3个点.