Reactjs:没有从Render返回任何内容

我已经用 create-react-app 创建了我的第一个组件。但是,由于浏览器窗口中出现此错误,项目无法生成或呈现:

CountDown(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.
./src/index.js
D:/ReactDev/CountDownReact/countdown/src/index.js:8

这是我的 index.js 文件代码:

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import Bulma from 'bulma/css/bulma.css'
import App from './components/App/App';
import registerServiceWorker from './registerServiceWorker';

ReactDOM.render(<App />, document.getElementById('root'));
registerServiceWorker();

以及 App.js 在我导入新组件的位置:

import React, {Component} from 'react';
import './App.css';
import CountDown from '../countdown/Countdown';

class App extends Component {
    render() {
        return(
            <div className="App">
                Hello React
                <CountDown/>
            </div>
        );
    }
}

export default App;

最后,我的 Countdown 组件代码:

import React from 'react';

const CountDown = (props) => {
    <section class="section">
        <div className="hero-body">
            <div class="container">
                <h1 class="title">Section</h1>
                <h2 class="subtitle">
                 A simple container to divide your page into <strong>sections</strong>, like the one you're currently
                reading
                </h2>
            </div>
        </div>
    </section>
};
export default CountDown;

我还需要在这里导入我的新组件吗?我该如何解决这个问题。谢谢。