A tall stepladder stood in front of an opening which the grille had covered.
在原来铁栅栏盖着的那个洞口前面,放着一个高梯凳.
Tell him to back down carefully. The stepladder is not steady.
告诉他小心下来, 活梯不稳.
He also made the first pair of bifocal glassed and invented a musical instrument called the glass harmonica and the stepladder chair.
他还制作出了世界上第一幅双光眼镜,发明了玻璃碗琴和活梯。
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