1. We keep trying all four methods, but the sheer volume of rubbish we produce worldwide threatens to overwhelm us.
    我们一直在试这4种方式，但是，我们在世界范围内仅产生的垃圾的量就有把我们覆盖的危险。

2. Their mission was to seize the bridge and overwhelm the garrison.
    他们的任务是占领桥头, 打垮驻军。