由于屋顶上有一个洞，燕子很容易进去。
It was easy enough to get in, as there was a hole in the roof.
如果它实际存在，它必定在某处，而且，假如那个地方你很容易进去，你可以直接观察查证它的真实性。
If it actually exists it must be somewhere, and, assuming its place to be accessible to you, you can verify its factualness by direct observation. Take the case of the White House.
公园的景观和容易进去使其在夏季成为划桨和露营夏令营的一个热门场所，秋天却显现出极为美丽的植物枝叶。
The park's vistas and accessibility make it a popular destination for paddling and camping in summer, and fall brings stunning displays of foliage.
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