It has long been concerned much to study the low yielding swamped farmlands.

渍害低产农田的研究，长期以来是人们十分关注的问题。

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Special education has long been concerned with the problem of classroom teaching in special schools.

特殊教学课堂教学一直是特殊教育工作者所关心的问题。

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There have been controversies about the psychological mechanism of intuition, a special thinking mode which has long been concerned with.

直觉是一种很早就备受关注的特殊的思维形式。关于直觉的心理机制众说纷纭。

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The IRS has long been concerned about curbing offshore tax evasion, but in recent months the issue has taken a new turn.

FORBES: Magazine Article

India has long been concerned about terrorist infiltrators from Pakistan.

ECONOMIST: Civil liberties

Israel has long been concerned that the Sinai Peninsula is fast becoming ungoverned space: a Bedouin-dominated mini-state beyond Cairo's control, with various radical Palestinian groups often linked to local Bedouin extremists operating at will.

BBC: Sinai attack marks step change in border violence