月亮词典
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undercourse
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Revetments must be sturdy
and
durable
,
able
to
resist
damages
caused
by
various
factors
.
Their
undercourse
must
not
be
scoured
.
对上下游护坡的要求是坚固耐久，能抵抗各种因素的破坏作用，并保证底层不受淘刷。