不要指望阿瑟会站起来为自己说话，他胆小如鼠。要有别的人来保护他的利益。 It's no use expecting Arthur to stand up for himself: he's as timid as a mouse. Somebody else will have to protect his interests.
他的妻子竟然胆小如鼠，一句话都没说。 His wife, a strange little mouse, never said anything.
他在敌人面前胆小如鼠，真是可鄙。 His cowardice in face of the enemy was contemptible.