The hydrogeologic condition of Danhou mine is complex, and the sublevel coal is threatened by O. L. water. It is very difficult that thin confining bed coal is mined under pressure.
单侯矿井水文地质条件比较复杂，下部煤层受奥灰水威胁，薄隔水层带压开采问题非常突出。
2
Under the ship, he printed in big red letters: C-O-N-G-R-A-T-U-L-A-T-I-O-N-S!
在船下面，他用红色大字写着：C-O-N-G-R-A-T-U-L-A-T-I-O-N-S！
3
One day, while I was playing with my new doll, Miss Sullivan put my big Rag Doll into my lap also, spelled "d-o-l-l" and tried to make me understand that "d-o-l-l" applied to both.
有一天我正在玩一个新娃娃，沙利文小姐把我的大布娃娃也放在我腿上，然后写了“d - o - l - l”这几个字母，她是想让我知道“d - o - l - l”既可以指新娃娃，也可以指旧娃娃。