求翻译：In the 1930s, issues of truth and falsity were proposed because of the birth of the doctrine of logical positivism, which claims that unless a sentence can, at least in principle, be verified, it was strictly speaking meaningless. Under such circumstance, The theory of speech act, proposed by Austin, and later developed further by Searle, mainly takes language as an act and attaches great importance to pragmatic elements as participator’s intent as well as context, and now it has become the well established theory in the field of philosophy and pragmatics.是什么意思？

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