Further, gold is not only prohibitive to purchase these days; it's expensive to keep, lying in a guarded safe-depositbox.
进一步讲，黄金在当今不仅禁止买卖，储存也成本很高，需要放在看守严密的保险箱内。
2
Unlike many, however, Curie felt her place was in Paris. After the radium was in a Bordeaux safe-depositbox, she returned to Paris on a military train.