L There is no scientific proof that any ET life form has ever visited the Earth.
l还没有任何科学证据可以证明外星生命曾经访问过地球。
When I visited your converter workshop last year, the worker there told me that they used the L.
我去年参观你们厂的转炉车间时，那儿的工人告诉我说他们采用的是L。
When I visited your converter workshop last year, the worker there told me that they used the L.
我去年参观你们厂的转炉车间时，那儿的工人告诉我说他们采用的是L。
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