Mining backfilling is restrained by relatively high filling cost.充填采矿由于充填成本较高而制约着其发展.High - water rapid - hardening backfilling with whole tailings is a new developed backfilling technology.全尾砂高水速凝充填技术是一项新近发展起来的充填技术.Its ...
Ferries churn the waters of Howe Sound from Langdale to Horseshoe Bay.渡船搅起豪湾的海水，从兰代尔驶向霍斯舒湾。A goose's wings churn the air and leave an air current behind.一只大雁的翅膀扇动空气,在身后留下一股气流.They churn out 3 000 identical toy train...
在我弟弟的高中毕业典礼上，学生们朗诵了一首诗。At my brother's high school graduation the students recited a poem.这首诗再怎么晦涩，至少有一点是清楚的。Whatever its obscurities, the poem was clear on at least one count.这些诗激发了一代又一代孩子的想象力。These poems have help...