But their number triples every decade.

但它们仍以每十年翻三倍的速度递增。

This number tripled to reach about 25 pairs of shoes a year.

平均买五到八双鞋子。

That total number of settler homes this year being advanced is nearly triple the number last year.

今年建造的定居者住房总数几乎是去年的三倍。

And some protected bicycle lanes see double or triple the number of cyclists, which would put the number of cyclists at or above the number of people using parking on Palm Street.

一些受保护的自行车道上的骑车人数是原来的两倍或三倍，这意味着骑车人数等于或超过了棕榈街停车场上的骑车人数。