but this simple exercise
但是这个简单的练习
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This is a simple stretching exercise but yet extremely effective.
这是一个简单的伸展练习，但非常有效。
youdao
This is to exercise your eye muscles and increase their flexibility. This is quite a simple exercise but a good one.
这种方法旨在锻炼眼肌，增强其灵活性。十分简单却很有益。
This is quite a simple exercise but a good one.
十分简单却很有益。
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