然而，韩礼德理论也存在一定的不足。
However, in Halliday's theory, there are certain inadequacies.
但是，我们的研究也存在一定的不足。
虽存在一定的不足之处，但仍得到广泛应用。
Though it has some deficiency, it is still be applied widely.
目前常用的几种间隙模型都存在一定的不足，不完全符合实际运动。
These kinds of passing model can not exactly coincide with the actual motion.
而目前的搜索引擎都存在着一定的不足。
However there are some disadvantages in current search engines.
本研究虽然取得了一定的成果，但是也存在一些不足之处。
Though our research has got certain results, there is also some deficiency.
本研究虽然取得了一定的成果，但是也存在一些不足之处。
Though our research has got certain results, there is also some deficiency.
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