Tại sao chúng ta không phóng rác lên Mặt Trời? (Why Don't We Launch Our Trash Into The Sun?)

US /sɪɡˈnɪfɪkənt/

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UK /sɪgˈnɪfɪkənt/

US /məˈtɪriəl/

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UK /məˈtɪəriəl/

US /skel/

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UK /skeɪl/

US /ɪmˈpruv/

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UK /ɪm'pru:v/