1.你好朋友 这是在不明确的情况下用的。one is。。other one is。.如果是在特定的情况下，就用冠词The,The one,the other one 特指某一个事物 望采纳哦
2.ocean although cheaper, but the billing is very complex, to the port, there may be a lot of uncertainty in the cost of. freight forwarding said, you need to determine the best way 。
3.perhaps I imagine I not sur。
Uncertain 不确定的，不稳定的，不明确的。
I wonder whether ... I doubt + 疑问词 + 从句 I have some doubt about ... There is some doubt + 疑问词+ 从句 There is some doubt about ... It is not known + 疑问词+ 从句 It is not decided yet + 疑问词+ 从。
undefined 未定义的
1.英语在说不确定男女（ 身份）时的他是用什么啊he还是her----- 用 it , that ,this---- 如； who is it in the picture？ 照片中那是谁？----- who is that ？ 你是谁？ it's me . 是我。--- 。
2.你好！ 不确定性 uncertainty 英[ʌnˈsɜ:tnti] 美[ʌnˈsɜ:rtnti] n. 无把握，不确定; 不可靠; 不确实知道。
3.我不确定该在会议上讲些什么的英文
