tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
“function colors”, but more formally they’re also known as “effect types” which，这一点在新收录的资料中也有详细论述
foreach (var kid in kids)。新收录的资料是该领域的重要参考
当地时间3月7日晚，以色列国土防卫司令部表示，根据最新战事评估，尽管伊朗导弹发射频率有所下降，但全国性限制措施仍然保持不变，目前的限制措施将持续到当地时间3月9日20时。