“难以清楚辨认的”可以用英语表达为 “hard to discern clearly”、“difficult to identify clearly” 或 “illegible（针对文字等难以辨认的情况）” 等，具体使用需根据语境。以下为详细说明：
1、 hard to discern clearly
含义：表示难以清晰地察觉或分辨。
例句：The details in the old photograph were hard to discern clearly.（那张老照片里的细节难以清楚辨认。）
2、 difficult to identify clearly
含义：强调难以清晰地确定或认出。
例句：The faint footprints in the sand were difficult to identify clearly.（沙滩上那些模糊的脚印难以清楚辨认。）
3、 illegible（针对文字等难以辨认的情况）
含义：专门用于描述文字、书写等模糊不清，难以阅读。
例句：The handwriting on the old letter was so illegible that it was hard to discern clearly what it said.（那封旧信上的字迹太潦草了，难以清楚辨认上面写的内容。）