Oh, Grandpa will be so pleased that you're wearing them.
噢 ,戴了它, 祖父一定会非常高兴。
A fall into the pit, a gain in your wit.
吃一堑,长一智。
After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.