First, the pronunciation is different
1.piece
Pronunciation: English? [pi? s]? Beautiful? [pis]?
2.loaf
Pronunciation: English? [l? f]? Beautiful? [lof]?
3.slice
Pronunciation: English? [sla? s]? Beautiful? [sla? s]?
Second, the meaning is different
1.piece
Interpretation: block; Pieces; Articles; Coins.
2.loaf
Interpretation:? A loaf of bread.
3.slice
Interpretation: thin sheet; Part; Kitchen knife, fire shovel.
Third, the usage is different
1.piece
Usage:? Represents a piece (removed, torn off or cut off from something); Film; Duan.
2.loaf
Usage: it means long stick-shaped bread, which is often used for long loaf? Long bread, a loaf? A loaf of bread.
3.slice
Usage: means "cut off; To divide into parts; Slice ",often used to express (cut food) slices.