prop up; support
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这几根柱子撑得住那么重的屋顶吗?
Can these few posts support the heavy roof?
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撑得住
be strong enough to prop up/support
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撑不住
be unable to prop up/support
sustain; keep up; go on with
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那里很艰苦,你撑得住吗?
Can you stand the hardships there?
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撑得住
be able to hold on/put up with/sustain
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撑不住
be unable to put up with; be unable to sustain