句子主干——主语：The currents of air；动词：are；表语：enough其他成分——1、that the walls of the ship direct upwards：名词结构The currents of air的关系分句（又称定语从句），该分句成分如次：主语：the walls of the ship；动词：direct；宾语：that；宾补：upwards。2、as well as：并列连词，连接1中的分句和3中的后置修饰语。3、in the line of s course：介词短语做currents的后置修饰语。4、to give the great bird with its immense wings sufficient sustenance and progress：不定式结构做形容词enough的补语；其中bird是动词give的间接宾语，sustenance and progress是直接宾语，with its immense wings是介词短语作名词bird的后置修饰语。补充回答——1、首先，提问者对问题最好能一次表述得完整清楚，免得反复之累。2、很多情况下，翻译不是只在字面，更牵涉到逻辑常识。1）船体(the walls of the ship)向上散发热量，必定会引起气流(The currents of air)顺势而上；2）船在前行中，必然沿着航线(in the line of its course)带起气流；3）所以，The currents of air that the walls of the ship direct upwards, as well as in the line of its course就意为：船体向上带起的气流，以及船在行进中产生的气流。