This problem is too difficult for primary school children to solve.
这个问题让小学生解决太难了。
My primary concern is your safety.
我最關心的是你的安全。
Over the next fifteen years, architects, planners and community developers will work together to transform 346 acres of industrial wasteland into 6,500 homes, two shopping centres, a marina, a primary school and college, and parkland.