Bootstrap 4中单行上的多个表单组

<div class="form-row">
  <div class="form-group col-md-4">
    <label for="inputName">姓名</label>
    <input type="text" class="form-control" id="inputName" placeholder="请输入姓名">
  </div>
  <div class="form-group col-md-4">
    <label for="inputEmail">邮箱</label>
    <input type="email" class="form-control" id="inputEmail" placeholder="请输入邮箱">
  </div>
  <div class="form-group col-md-4">
    <label for="inputPassword">密码</label>
    <input type="password" class="form-control" id="inputPassword" placeholder="请输入密码">
  </div>
</div>