该理论留下了一些残余问题没有解决。

The theory leaves behind certain ___residual problems unsolved.

洗完衣服后，洗衣机里还有一些残留的水。

After washing the clothes, there was still some ___residual water in the washing machine.

音乐家们每年都会收到歌曲播放的剩余版税。

Musicians receive annual ___residual royalties for their song plays.