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。
Sounds easy, doesn't it? In practice, merging branches often is easy. But the edge cases can be really tricky.
听来很简单吧？在实践中，合并分支通常是简单的。但是有的突出的案例却真的比较复杂。
Children need to learn to listen to all of the sounds in a word. Identifying middle vowel sounds is often tricky.
为什么？孩子们需要学会听出单词中的音素。而辨认出单词中间的元音是有难度的，需要多做类似的活动练习。
A language is made up of ideas, rules and sounds, and learning new stuff can sometimes be a bit tricky.
语言是由想法、规则和发音组成，学习新的东西有时候会显得有点棘手。
A language is made up of ideas, rules and sounds, and learning new stuff can sometimes be a bit tricky.
语言是由想法、规则和发音组成，学习新的东西有时候会显得有点棘手。
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