问题描述：
as such 的as是什么词性
We were careful to control for other pos-
sible changes,such as nutrition and work effort.
Additionally,we accounted for the impact of stress.
Any effect on cognitive performance then observed
would thus illustrate a causal relationship between
actual income and cognitive function in situ.As
such,the two studies are highly complementary.
The laboratory study has a great deal of internal
validity and illustrates our proposed mechanism,
whereas the field study boosts the external valid-
ity of the laboratory study.
We were careful to control for other pos-
sible changes,such as nutrition and work effort.
Additionally,we accounted for the impact of stress.
Any effect on cognitive performance then observed
would thus illustrate a causal relationship between
actual income and cognitive function in situ.As
such,the two studies are highly complementary.
The laboratory study has a great deal of internal
validity and illustrates our proposed mechanism,
whereas the field study boosts the external valid-
ity of the laboratory study.
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