有关yet的用法Because many of the minerals found on the ocean floor arestill plentiful on land,where mining is relatively inexpensive,mining the ocean floor has yet to become a profitable enterprise这句话的准确翻译是什么?has yet to bec

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有关yet的用法
Because many of the minerals found on the ocean floor are
still plentiful on land,where mining is relatively inexpensive,
mining the ocean floor has yet to become a profitable enterprise
这句话的准确翻译是什么?
has yet to become是表达否定么?

因为在海底发现的许多矿石种类在陆地上产量甚丰,
开采成本也相对较低,因此海底开采还不是有利可图的产业.
have yet to ,表示 还未...

agree with the upstairs'

我英语差不多``我帮你翻译 试试看``
因为在海底上被发现的许多矿物是
仍然许多在采矿是相对地廉宜的土地上,
采矿海底还没有变成一个有利润的企业
has yet to 表示还未…………表示否定`

has yet to
表示还未
有期待的意思。