If you want to watch more than one element at the same time, you can append a comma and the number of elements as so:
(v._Myfirst)[startIndex], count
However, note that count must be a constant, it cannot be the result of another expression.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…