一开始，孙小姐苦于没有留下有力的证据而投诉无门。
At the beginning, Miss Sun suffer no evidence and leave no complaints.
自动门的门体一般无曲线运动和复合运动形式。
The door body of the automatic door has no curvilinear motion and complex motion.
而由于国际贸易程序的复杂，许多中国企业讨债无门。
As international trade process is complicated, many Chinese enterprises can not collect the bad account.
而由于国际贸易程序的复杂，许多中国企业讨债无门。
As international trade process is complicated, many Chinese enterprises can not collect the bad account.
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