她用合成器创作了一首电子音乐。

She composed an electronic song using her ___synth.

我的新运动鞋是用合成材料制成的，非常轻便。

My new sneakers are made of ___synth material, which makes them very lightweight.

这首歌曲使用了大量合成器音效，很有未来感。

This song uses a lot of ___synth sounds, giving it a futuristic feel.