假设你要用多米诺骨牌去盖一副国际象棋，每个多米诺骨牌刚好能盖2个方格。
Imagine you are trying to cover a chessboard with pieces of domino each that covers exactly two squares.
以回避争论而著称的莱弗茨耸了耸眉毛，装出一副可笑的怪相，警告对方格子后面那姑娘在留心观察。
Lefferts, who was known to shrink from discussion, raised his eye-brows with an ironic grimace that warned the other of the watching damsel behind the lattice.
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