老师们好！在下面的内容中，有几个句子，经过查阅词典好参考书我还是不懂，特提出来，向老师们求助：

When we see someone for the first time, we interpret many tiny things from their faces. But since the pandemic began, we have often been interacting with people whose faces we can only half see. And this goes both ways,weakening our ability to offer a friendly smile. So what does it mean to go more than a year without seeing smiles as steadily as we did before?

我的问题：

1. interpret many tiny things 是什么意思？

2. can only half see 是什么意思，其中的half是什么词类，作什么成分？

3. this goes both ways是什么意思？this 和both ways各指什么？