以下为句子列表：
英文: Early aircraft were insubstantial constructions of wood and glue .
中文: 早期的飞行器是木头和胶粘合的脆弱机器.
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英文: Early aircraft were insubstantial constructions of wood and glue.
中文: 早期的飞行器是木头和胶粘合的脆弱机器.
更详细...
英文: The rest were an insubstantial pageant .
中文: 其余的都不过是华而不实的过眼烟云罢了。
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英文: Together, these particles form that most diffuse and insubstantial of substances -- interstellar dust.
中文: 聚集在一起，这些微粒形成了大多数弥漫、脆弱的物质——星际尘埃。
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