The frog is an amphibian in the order Anura (meaning "tail-less" from Greek an-, without + oura, tail), formerly referred to as Salientia (Latin saltare, to jump). Adult frogs are characterised by long hind legs, a short body, webbed digits, protruding eyes and the absence of a tail. Most frogs have a semi-aquatic lifestyle, but move easily on land by jumping or climbing. They typically lay their eggs in puddles, ponds or lakes; an
首先需要纠正的是认识上的错误,即英语26个字母中的元音和英语音标中的元音是不同的,英语26个字母中的元音只有五个a e i o u 这是没有错误的,但是英语音标中的元音却远远不止这些
具体如下
20个元音
[p][b][m][w][h][i:][i][t][d][n][j][r][E:][E][k][g]
[N][l][C:][C][f][v][u:][u][s][z][B:][Q][W][T][e[A]
[F][V][ai][ei][Ci][tF][dV][iE][ZE][uE][tr][dr][Eu]
[au][ts][dz]
48个国际音标表
元音
12个单元音
长元音
[i:][E:][C:][u:][B:]
短元音
[i][E][C][
Expertise consists of those characteristics, skills and knowledge of a person (that is, expert) or of a system, which distinguish experts from novices and less experienced people. In many domains there are objective measures of performance capable of distinguishing experts from novices:expert ches
above all - most importantly
account for - explain
as a matter of fact - in fact ,to speak the truth
as a rule - generally ;normally
about to - be ready to;be on the point of doing something
an old hand - be an experienced persom
any day now -soon
approach sb -talk to sb
