Staying awake ______ taking online classes is hard. Airwaves can help! 線上上課時要保持清醒是很困難的；好在 Airwaves能幫忙！
The quality control manager is amazing to have ______ these minute flaws in this batch of products. 那位品管經理非常厲害，可以在這一批產品中找出這麼細小的瑕疵。
beta
beta
