スイスイlightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily

魚(さかな)がスイスイと泳(およ)いでいます。

The fish is swimming lightly and smoothly. {lightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily}

問題(もんだい)が簡単(かんたん)なのでスイスイ解(と)けました。

Since the problem was simple, I was able to solve it swiftly and easily. {lightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily}

ペンギンが氷(こおり)の上(うえ)をスイスイと滑(すべ)っています。

The penguin is gliding lightly and smoothly on the ice. {lightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily}

アメンボが池(いけ)の水面(すいめん)をスイスイと滑(すべ)るように移動(いどう)している。

The water strider is moving as though it is gliding lightly and smoothly on the surface of the pond. {lightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily}

彼女(かのじょ)はクラス一(いち)番(ばん)の才女(さいじょ)で、どんなに難(むずか)しい問題(もんだい)もスイスイ解(と)きます。

She is the most talented girl in the class, and she solves even the most difficult problems swiftly and smoothly. {lightly and smoothly (of movements), swiftly, glidingly, (progressing) smoothly, (solving) easily}