Since reserve，a show of modesty and a sense of humor are part of his own nature，the typical Englishman tends to expect them in others.

in others：others 指“别人”； in others  表示前文提到的那几种品质（them）“在别人身上” 也要有。

【翻译】由于矜持、谦虚和幽默感是其天性的一部分，典型的英国人往往期望别人也有这些品质。