【逐句解析】

第一句：这一句包含了几个短语：

open up to...  对......开放

prefer to do. 更喜欢做......

第二句：be seen as ... 被看作是......, 被认为是......

when the bride wears white dress...，在那个时候，新娘穿白色婚纱。

第三句：be sure not to do  一定不要做

第四句：......in critical condition (病情）处于危重状态，在关键时候

【主题分类】汉译英：文化

【参考译文】

With China’s reformation and the policy of opening up to the outside world, many young people prefer to have western-style wedding ceremony, when the bride wears white wedding dress, as white is seen as the symbol of purity. In traditional Chinese culture, however, white is often a color for funeral. So be sure not to send white flowers to patients to express the wish for their recovery, especially the old or the ill in a critical condition. Similarly, cash gift should be wrapped in a red envelope instead of white ones.