Fred sand back 弗雷德
back sand 背砂
back up sand 充填砂
back filled sand 回填砂
Drop-back sand unit 落砂单元
oil no-back sand mold 油改性树脂自硬砂型
Arrived on the bank, see have a lot of fine sand, install full sand back to come home with hop-pocket .
到了岸上,看见有许多细沙,便用布袋装满沙子背回家去了。
People have planted a great many trees in order to hold back wind and sand in the desert.
为了阻挡沙漠中的风沙,人们种了很多树。
When I came up sputtering, Jim smiled approvingly and we swam a few strokes to the beach, lay on the hot sand for awhile, and then swam back across the pool to do it again.
当我奋力跳入潭中后,吉姆赞许地冲我微笑,我们划了几下水游到了沙滩上,在热沙子上躺了一会儿,然后游回对岸,再把这种活动做一遍。
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