He proved overconfident on the witness stand, misremembering a key piece of evidence.他在证人席上表现得过于自信，记错了一条重要的证据。She warned me against being overconfident.她告诫我不要过于自信.People who are overconfident tend to neglect their defici...
纤维素是带有好多羟基的不幼链环型布局的聚合物.Cellulose is a very polyhydroxylated of long - chain - type structure of the polymer.使用的催化剂对醇 羟基 的氧化具有高度的选择性并有很高的转化率.These reactions catalyzing oxidation of alcohol - OH groups have high yield and ...