By training yourself to look on the bright side, you will gain more courage to face difficulties.
通过训练自己保持乐观的态度，你会获得更多的勇气以面对困难。
2
During the training stage, each dog was shown only the upper half or the lower half of the person's face.
在训练阶段，每只狗只看到人脸的上半部分或下半部分。
3
The researchers then tested the dogs' ability to distinguish between human facial expressions by showing them the other half of the person's face on images totally different from the ones used in training.