But personally I believe a business letter should end with Very truly yours, not Sincerely.
还行,乔治。但是我个人相信一封商业信函应该以“敬上”结尾,而不是“谨启”。
From these he can go on to appreciate more complex forms or combinations of several forms.
从这些形体出发,观赏者可进一步观察更为复杂的形体或若干形体的组合。