His fierce characteristic is not merely caused by congenital animal character bur mostly the influence of the living environment later.
他的恶不仅仅是先天的动物性所致，更多的是后天生活环境的影响。
Letter of credit must bear a valid period which may be longer than the shipping period, bur the shipping date should not be later than the validity date of the credit.
信用证必须有有效期，信用证的有效期可以晚于装运期，但装运期却不能迟于有效期。
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