Some 55 letters are needed to trigger a confidence vote by the 361 Tory MPs, with a simple majority needed to force a new leadership election.
这里的 some 是啥意思？ 是至少，还是大约？
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About…. Approx. at least
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around， 大约
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查了半天，新华字典，还是查不到some的真正含义，只好请这里的高手。
谢谢您们的回复！