in-,不，非，substantial,结实的，牢固的，实体的。

1. Mars has an insubstantial atmosphere, consisting almost entirely of carbon dioxide.

火星的大气层极其稀薄，几乎全部由二氧化碳构成。

2. an insubstantial construction of wood and glue

用木头和胶粘合的简单构造

3. Her limbs were insubstantial, almost transparent.

她的四肢非常纤细，几乎是透明的。

4. Finite personalities are insubstantial fragments of this engulfing spiritual unity.

有限的人格是这种兼容并包的精神统一的非实体的碎片.

5. Early aircraft were insubstantial constructions of wood and glue.

早期的飞行器是木头和胶粘合的脆弱机器.