You can't expect to learn a foreign language in a week.
别指望一个星期就能学会一门外语。
We can live without our friends, but not without our neighbours.
生活可无友,邻居不能无。
The price we pay for cheap food may be already too high: Mad Cow Disease (BSE) in cattle, salmonella in chicken and eggs, and wisteria in dairy products.