difficult-to-break emulsion 难于破乳的乳状液
It's difficult to break-into the music industry.
进入音乐圈是一件困难的事情。
The only problem is that it's often difficult to break into writing at first.
唯一的问题就是刚开始写作的时候有点儿难。
The reason nappies are difficult to break down has nothing to do with their use.
尿布难于降解跟它有没有被使用过毫无关系。
But analyst Ryan Radia says that even if that is the case, governments could still lose because modern technology allows virtually anyone to circumvent the bans and use other encryption methods that are extremely difficult to break.
VOA: standard.2010.08.02
"I was one of these teenagers, and so I know how difficult it can be to break this habit when it's been with you for a long time,".
VOA: standard.2009.06.22
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