thenceforth /ˈðɛnsˌfoɚθ/ adverb Learner's definition of THENCEFORTH
formal
: from that time forward : starting then从那时起 -
He was determined thenceforth to dedicate himself to his studies.他从那时起决心要努力学习。
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Thenceforth, she decided, she would deal with the media herself.从那时起，她决定自己来应付媒体。