Top Cover， Bottom Cover， And Cover Board

Graded(channel) terrace (Drainagetype terrace)

Interception and diversion-type terrace ( Drainagetype terrace)

Interception and retention-type terrace ( Absorption-type terrace)

Level terrace ( Absorption-type terrace)

shore-face terrace(wave-built terrace)

Nicholas terrace (Drainage-type terrace)

Mangum terrace (Broad base terrace)

cover-to-cover translation

from cover to cover

with average cover {= WA Cover}

a terrace sequence

abrasion terrace

absorption terrace

Absorption-type terrace

accumulation terrace

active terrace die

aggradation terrace

aggradational terrace