第一艘成功的飞船是法国的吉法尔于1852年制造的，后来经过不断的改进，导致1900年齐柏林飞船的建构。
The first propeller-driven airship, built by Henri Giffard, flew in 1852 in France; design improvements led to construction of the rigid zeppelin (1900).
本文认为她的女性意识是不断变化的，经过了最初的爱情社会价值论到后来的爱情本质论的转变；
This paper holds that her female consciousness changed from her early focus on social values of love to her latter focus on essentials of love itself.
本文认为她的女性意识是不断变化的，经过了最初的爱情社会价值论到后来的爱情本质论的转变；
This paper holds that her female consciousness changed from her early focus on social values of love to her latter focus on essentials of love itself.
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