1·To pledge one's obedience to; impose (a vow or promise) upon oneself.
宣誓服从…；使自己(发誓或许诺)。
2·Pledge to oneself never to abandon until...
对自己发誓未……之前决不放弃。
3·For oneself last pledge that, Must be brave!
给自己最后一个承诺：要勇敢！