We had to come here to seek assistance.

我们不得不到这儿来寻求帮助。

I had to come here to seek assistance.

我只好到这里寻求帮助。

We had to come here to seek assistance.

我们只好来到这里寻求帮助。

Japan successfully, China must seek assistance from other powers.

要抗日成功，中国也必须得到其他国家的援助。

To appose Japan successfully, China must seek assistance from other powers.

要抗日成功，中国也必须得到其他国家的援助。