Rfu
放射免疫聚焦裝置（radiommunofocus unit）
??? 情景例句
It probably means we can't stay.
看來我們不能待在這兒了。
A strong grip was necessary to hold onto the large dog.
若要牽住大狗，必須用力握住皮帶。
She herself read them to me by spelling into my hand what was written in the book.
她親自通過在我手上拼寫書中的內容，把課本對我讀出來。