单词fetchers
Even today, RNA molecules are not only messengers; they are also fetchers and carriers of amino acids, the building blocks of proteins.
即使是今天，RNA分子也不只是信使；他们还是蛋白质的基础单元，氨基酸的采集者和运输者。
Fetchers download data from an external source. Choose a fetcher suitable for the external source you would like to download from.
撷取器会从外部来源下载资料。请选择适合您想要下载外部资料的撷取器。