如何在Laravel中连接三个表？

// User模型
public function posts()
{
    return $this->hasMany(Post::class);
}

public function comments()
{
    return $this->hasMany(Comment::class);
}

// Post模型
public function user()
{
    return $this->belongsTo(User::class);
}

public function comments()
{
    return $this->hasMany(Comment::class);
}

// Comment模型
public function user()
{
    return $this->belongsTo(User::class);
}

public function post()
{
    return $this->belongsTo(Post::class);
}

$user = User::find(1);
$posts = $user->posts()->with('comments')->get();

foreach ($posts as $post) {
    echo $post->title;
    foreach ($post->comments as $comment) {
        echo $comment->content;
    }
}