如果我有3个以上的帖子，我在显示多行帖子时会遇到问题。如果我有更多帖子，如何设置更多行？例如，如果我有7篇文章，我应该有3行。我可以这样做吗？如果是，如何进行？

<div class="row-fluid shop-products" >
    <ul class="thumbnails" >
    <?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
        <li class="item span4" >
            <div class="thumbnail" id="archive_thumbnail">
                <a href="<?php the_permalink();?>" class="image">
                    <img src="<?php the_field( \'photo\' ) ?>" alt="" id="archive_photo">
                    <span class="frame-overlay"></span>
                    <span class="price"><?php the_field( \'price_from\' ) ?></span>
                </a>
                <div class="inner notop nobottom">
                    <h4 class="title"><?php the_field( \'title\' )?></h4>
                    <p class="description"><?php the_field( \'content\' ) ?></p>
                </div>
            </div>
            <div class="inner darken notop">
                <a href="#" class="btn btn-add-to-cart">Add<i class="icon-shopping-cart"></i></a>
            </div>
        </li>
    <?php endwhile; ?>
    </ul>
</div>