The Mediterranean architecture was always that simple white frame -sometimes invisible- where man comes to happiness almost without realizing it.

地中海建筑始终是简单的白色框架为特色，这样的建筑给人莫名的幸福感。

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Those who study vivax sometimes feel that the object of their attention is invisible.

那些研究间日疟原虫的人有时候觉得他们的所关注的对象是无形的。

youdao

I sometimes feel as if I'm invisible, as if no one can see me at all.

有时觉得自己像个隐形人，仿佛根本没人能够看得见我。

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She told Cynthia she sometimes felt invisible there.

NPR: One Boy's Heroism in the Face of AIDS

Politicians fear this sometimes-stern invisible hand.

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Belief in this invisible but more powerful reality, sometimes called the world of the gods, is a basic theme of mythology.

NPR: Karen Armstrong: Myths and the Modern World