This may make it more difficult to sustain initial results.
这可能使它更加难以维持了初步成效。
He found it difficult to sustain an interest in their talk.
他感到很难对他们的谈话保持兴趣。
He found it difficult to sustain good relationship with them.
他发现要与他们保持良好关系是很难的。
For many reasons, it is difficult to sustain their friendship forever.
由于种种原因，戴良与宋濂的友谊很难维持下去。
You are in my life salt, your my life has not been difficult to sustain.
你是我生命里的盐，没有你我的生命难以为继。
He seems to find it difficult to sustain the relationship with the woman.
他发觉很难与这个女人长期维持关系。
But beating the market is an incredibly difficult trick to sustain.
但是要持续跑赢大市却是一件极其艰难的工作。
That becomes a difficult feeling to sustain if we have already seen ourselves doing it.
如果我们已经发现自己正在做了，那就形成了一种难以继续下去的感觉。
That becomes a difficult feeling to sustain if we have already seen ourselves doing it.
如果我们已经发现自己正在做了，那就形成了一种难以继续下去的感觉。
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