Examples
yóu yú由于zhǒng zhǒng种种yuán yīn原因，tā men他们zài在fǎ法guó国de的jià qī假期méi没ràng让tā men他们gǎn dào感到mǎn yì满意。
由于种种原因，他们在法国的假期没让他们感到满意。
For one reason or another their holiday in France didn't come up to expectations.
他克服了种种困难和挫折，终于成功一个人越过了南极洲。
He overcame all sorts of hardship and setbacks to succeed in a solo crossing of Antarctica.