ES6报错rawtext ";" must be wrapped in an <Text>

错误代码

//错误原因
rawtext ";" must be wrapped in an <Text>

//代码如下
_renderNum = (num) =>{
    if (num > 0){
      return (<Text>{num}</Text>);
    }else {
      return (<Text>{-num}</Text>);
    }
  };

render(){
return <View style={styles.row}>
  {this._renderNum(2)};
</View>
};

为什么报错呢？
因为多了个{this._renderNum(2)}多了个;
fuck !fuck !fuck !