🧩 词语组成解析
upon
[ə'pɑn]
prep. 在…上面;当…时候;
a. 人们的；自己的
guard
[ɡɑrd]
n. 警卫;狱吏，看守;护卫队;防护装置;
vt. 保卫，守护;看守;加防护装置;谨慎使用;
vi. 警惕;警卫;
🗣️ 情景例句
Please. That sounds good.
听起来不错，请给我弄一杯。
She was so stunned, that she couldn't speak.
她惊愕得说不出话来。
However, rescue operations are proving difficult.
然而，事实证明营救工作非常困难。