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理直：理由正确、充分；气壮：气势旺盛。理由充分，说话气势就壮。
[be in the right and selfconfident;be self-confident on the strength of one's being right;justly and forcefully; speak with compelling argument] 理由充分,言行因而有气势 只要我们理直气壮,怕他怎的!
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