打开圆桶的盖子，在底部的一侧开一个小口。
Remove the top of the drum and cut a small opening on one side at the bottom.
他主要研究生长于加勒比海珊瑚礁上的圆桶海绵。
He studies giant barrel sponges growing on coral reefs in the Caribbean.
这只小母牛在“探究”洗衣机的圆桶时不幸地把头卡在了里面。
The unlucky heifer was exploring the drum of a fly-tipped washing machine when its head became trapped.
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