  By using higher K-theory, we reinterpret and generalize an idea on
eliminating obstructions to deforming cycles, which is known to Mark Green,
Phillip Griffiths and TingFai Ng(for the divisor case). As an application, we
show how to eliminate obstructions to deforming curves on a 3-fold. This
answers affirmatively an open question by TingFai Ng.
