这条审查意见该如何答复和修改？

新手请教老师们，审查员来意见了，这条该如何答复？

审查员的意见如下：
5.   You description potentially casts doubt on the scope of your claims by indicating that everything from line 7 of page 2 to line 5 on page 5, is essential to your invention, except for the width of the second passage as described on line 8 of page 4 (which is qualified by 'advantageously'). In order to support the scope of your claims, your description should contain a statement of invention which requires only those features required by claim 1. Descriptions of preferred embodiments, which contain more than just the essential features, should be introduced in a way that makes it clear that they are non-limiting.

求助
a. 难道是“advantageously”惹的？是否应该改成“specifically”? 其他段落都是以“specifically”开头的，唯独这段是用“advantageously”开头的。
b. 如何答复结尾那句“should be introduced in a way that makes it clear that they are non-limiting.”