lusterless eyes的用法和样例：
例句
- I hadn't seen children with distended bellies and lacklustre eyes.
我没有见到肚子鼓起，两眼无神的孩子。 - He heard footsteps and dropped the paper back in the corner and stood just as he had before, his back against the wall, his eyes vacant and sleepy.
他听见了脚步声，就把报纸扔回到角落里，跟早先一模一样站着，背靠着墙，两眼无神，充满睡意。
