求大神修改下生成的代码

Blockly.Blocks['sound_recognition'] = {
init: function() {
this.appendDummyInput()
.appendField("Speech Synthesis");
this.appendDummyInput()
.appendField("Choose Language：")
.appendField(new Blockly.FieldDropdown([["US English Male","E"], ["Chinese Female","CF"], ["Chinese Male","CM"], ["Korean Female","K"]]), "lang_");
this.appendStatementInput("recognition_");
this.setPreviousStatement(true);
this.setNextStatement(true);
this.setColour(230);
this.setTooltip("");
this.setHelpUrl("");
}
};
Blockly.JavaScript['sound_recognition'] = function(block) {
dropdown_lang_ = block.getFieldValue('lang_');
var statements_recognition_ = Blockly.JavaScript.statementToCode(block, 'recognition_');
if(dropdown_lang_=="E"){
responsiveVoice.setDefaultVoice("US English Male");
var code=responsiveVoice.speak(statements_recognition_);
}
return code;

};

代码有什么问题，需要怎么修改、符合什么需求？

https://www.jianshu.com/p/693f92b07769