Give the cardboard two or three coats of varnish to harden it.在纸板上涂两三层清漆使其变硬。Rub the surface of the wood in preparation for the varnish.打磨木头的表面，为刷清漆做准备。You will need to apply three coats of varnish.需要刷三层清漆。...
它是用红砖建成的,非常漂亮,屋顶铺着铅板.It was very handsomely built of red brick with a lead roof.一块铝板横放在云室中,显然有粒子穿过铅板.A lead plate crosses the chamber and evidently the particle has passed through it.当然, 那现在是铅板和是在数十年.Of course, that a cl...