本集节目要回答的问题来自 “Zheng Lei”。他想知道如何区分 “protect、shield” 和 “guard” 这三个表示 “保护、防护” 的常用动词。这三个近义词分别用来 “保护” 哪些种类的事物不受什么影响？它们可以相互替换使用吗？听节目，学习这三个英语单词的区别。

VILNIUS, June 10 (Xinhua) -- Lithuania's Defense Ministry is finalizing the procurement of stationary systems for detecting and neutralizing unmanned aerial vehicles, citing the present tense geopolit ...

If the ocean is our planet’s “cradle of life”, then—in terms of their role in maintaining biodiversity—coral reefs are the ...