In sub-Saharan Africa today, for instance, gross investment accounts for roughly 15% ofnationalincome.
例如，在如今的撒哈拉以南的非洲国家，总投资大约占国民收入的15％。
《柯林斯英汉双解大词典》
2
It is not because households save so much of their income (although they do), but because household incomeaccounts for such a small slice of the national cake.