Oh, and there's no need to be alarmed about downloading and installing a container, either -- if the correct version of one is already on the local machine, Cargo skips Steps 1 and 2.

并且，不需要对下载和安装容器发出警告，或者，如果本地机器中已经存在了正确的版本，Cargo将跳过步骤1 和2。