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[求助] 英译汉（一段中的两句话）

nature某篇文章其中一段，帮忙翻译一下标红的地方，尽量精确点，前后文已经给出，非常感谢

Several anilines important for both organic synthesis and industry
are densely substituted with a variety of different functional
groups. Hence, for a generally applicable catalyst system it is essential
to perform the reduction of the nitro group highly chemoselectively.
Notably, such functional-group tolerance might also omit the
use of protecting groups and streamline more-complex syntheses.
Especially with respect to selectivity, the reduction of -NO2 in
the presence of other reducible substituents, such as ketones, aldehydes,
alkenes or alkynes, remains challenging. Most
common commercially available Raney–nickel, palladium or platinum
catalysts are troubled by these issues. Nevertheless, Siegrist,
Blaser and co-workers achieved the selective reduction of substituted
nitroarenes using commercially available platinum catalysts
modified by special additives. More recently, another important
development came from the group of Corma, who disclosed a heterogeneous
gold-based catalyst that can hydrogenate nitro compounds
selectively in the presence of a number of functional
groups. Nevertheless, so far there exists no inexpensive nonnoble
metal catalyst system that allows for a general reduction of
all kinds of nitroarenes.

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