unseen
adjective uk/ʌnˈsiːn/ us/ʌnˈsiːn/
未被看见的;无形的;隐形的
not seen or not able to be seen
She found the side-door open and slipped into the house unseen. 她发现边门开着,就偷偷溜了进去。
Unseen birds sang in the trees above us. 一些看不见的鸟儿在我们头顶的树上歌唱。
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