translation.en: But we only have a few thousand upstreamists out there right now, by all accounts, and that's why, a few years ago, my colleagues and I said, you know what, we need to train and make more upstreamists.
translation.zh: 但我们现在只有几千个逆流而上者， 数来数去只有这么多， 这就是为何， 几年前我和我的同事会说： 你们知道吗，我们需要训练和培养 更多的逆流而上者。