In considering a problem, one mustn't mistake the nonessentials for the essentials.
看问题时, 不要把支流当作主流.
《现代汉英综合大词典》
That car is my property; you mustn't use it without my permission.
这辆车是我的财产, 你必须得到我的允许才能使用.
《简明英汉词典》
We mustn't attempt unrestricted expansion regardless if it is within our capacity.
我们不能不顾自己的能力企图无限制地发展.
《简明英汉词典》
