洞眼(Eye of the cave)

葡萄牙南部迷人的阿尔加维海岸沿线有许多海洞和岩层，今天我们要向大家展示贝纳吉尔洞穴——该地区最壮观、最著名的自然地标之一。就在小渔村贝纳吉尔的东面，这个洞穴是大约2000万年前由大西洋拍打而来的海浪形成的。降雨导致较软的石灰岩段被侵蚀，在洞穴顶部形成了一个巨大的洞，这就是我们在照片中看到的。
原文：
Many sea caves and rock formations line the alluring Algarve coast in the south of Portugal, and today we’re shedding light on Benagil Cave – one of the region’s most spectacular and famous natural landmarks. Just east of the small fishing village of Benagil, the cave was formed about 20 million years ago from the pounding waves that sweep in from the Atlantic. Rainfall has caused the softer segments of limestone to erode, creating a giant hole in the cave’s roof, which is what we’re looking down through in our photo.
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