然而，这一进展是在一系列困难日益加剧的情况下取得的。
Yet this progress has been made against some ever-growing odds.
这样根本性的变革将可能涉及同地方电视台一系列困难的谈判。
Such a radical change would involve difficult negotiations with local stations.
然而一系列的负面数据表明经济复苏将缓慢且困难重重。
Yet the negative figures suggest economic recovery will be slow and difficult.
这一系列有些困难拍摄。
他还提出了一系列预警，说明了复苏可能会非常困难。
He continues with a series of warnings about how difficult that recovery may be.
他还提出了一系列预警，说明了复苏可能会非常困难。
He continues with a series of warnings about how difficult that recovery may be.
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