帮着翻译下边这段外文吧。谢了，不要机译，句子要通顺

The hydrophobic lipid interior of the membrane acts as a
barrier to the passage ofmany ions and largemolecules.
Moreover, membrane integrity and the functionality of
integral membrane proteins (for example the photosynthetic
machinery proteins) aremaintained bymembrane
structure and fluidity. Non-tolerant plants subjected to
salt stress commonly show decreased levels of 18:3 in
their membranes which suggests that the decrease in
18:3 reflects damage caused by this stress. Experiments
with transgenic tobacco cells and plants demonstratedthat overexpression of x-3 desaturases, which increases
18:3, increases tolerance to salt and drought stress
(Zhang et al. 2005). This suggests that tolerance of
plants to salt and drought is, to large degree, dependent
on the inherent level of fatty acid unsaturation and/or the
ability to maintain or adjust fatty acid unsaturation
(Berberich et al. 1998; Mikami and Murata 2003).<

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