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should英 /ʃʊd/|美 /ʃʊd/
解释
Should 倒装于句首表正式条件，等同于 'If you should need...'，主句用祈使句给出指示。
Should you need more time, please let us know before the deadline.
Should 倒装于句首表正式条件，等同于 'If you should need...'，主句用祈使句给出指示。