Timestamps (CTC or TDT):
Courses were developed by professional linguists, and it shows in the pacing. Each concept builds logically, then repeats through guided conversation and review sessions, so phrases stick long enough to use them on a real street, not just a quiz.
，这一点在服务器推荐中也有详细论述
Author(s): W. Dednam, E.B. Lombardi, Linda A. Zotti, C. Sabater
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September 2025: I added the Dreame Aqua10 Ultra Roller as the best robot vacuum for pet hair on carpet and shifted the Roborock Saros 10R (previously named the best robot vacuum overall) to the best robot vacuum for pet hair on hard floors.