Scioptics
通过透镜
🗣️ 情景例句
When would you be fond of receiving the call?
你喜欢什么时候叫您？
Waste of time is the most extravagant and costly of all expenses.
浪费时间是一切花费中最奢侈豪华的费用。
Ethanol is more effective at a concentration of 50-70 percent;
乙醇的浓度为50％至70％时比较有效，