Outdating
使過時( outdate的現在分詞 )
??? 情景例句
He is still unable to express himself in English.
他仍然不能用英語表達自己的意思。
Could you tell me where is the first-aid room?
你能不能告訴我急診室在哪里？
Once waves have been generated,
一旦波浪形成，