U 板岩，石板 type of blue-grey rock that splits easily into thin flat layers
C 石板瓦 small thin piece of this,used as a roof tile
C 候选人名单，提名名单 list of candidates for nomination or election
句型例句
Only a skilled workman can split slate into layers.只有能工巧匠才能把板岩劈成石片。
They roofed the house with slates.他们用石板瓦做屋顶。
The nominating committee laid its slate before the board.提名委员会把候选人名单提交全体委员会讨论。
