This, state your problem (I dont understand Mandarin?) and your needs (I want to be part of the discussions but I dont want to be the person pushing everyone to

This, state your problem (I dont understand Mandarin?) and your needs (I want to be part of the discussions but I dont want to be the person pushing everyone to speak English all the time?). By asking your team (and hearing them) they will understand and maybe come up with solutions (see e.g. parent) themselves. At least in Western culture teams I'd do this, not sure whether Eastern culture people would really say what they think though.