It too sounds a fine idea, but even top private schools, with lots of money and good teachers, find it tricky to timetable lots of variation within one age-group's lessons.
这听起来也是个好主意，可是即使是最顶尖的私立学校，有大笔的资金和优秀的老师，也认为在某个年龄段的课程中以一个课程表考虑到大量变化因素实在是勉为其难。
It sounds complex, and the packaging can be tricky, but storing energy in pressurized fluid often is more efficient than storing it in a battery.
这听起来有点复杂，而且包装方式可能很困难，但以高压液体储存能量的方式通常是比在蓄电池里储存能量的方式要有效的多。
It's not as tricky as it sounds.
这不是因为棘手，因为它的声音。
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