Avalvular
无瓣的
🗣️ 情景例句
We looked at a lot of houses.
我们看了好多房子。
Who are you writing to?
你正在写信给谁？
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.
那些计划去偏远地区旅行，或在饮用水不现成的国家居住的人，应该知道如何使水适于饮用的各种办法。