An initial experiment suggested that 20% of it vanished within 18 days in a dump-like environment.

最初的实验显示，在垃圾堆似的环境下，这种材料的20%将在18天内消失。

youdao

An initial experiment suggested that 20% of it vanished within 18 days in a dump-like environment.

最初的实验显示，在垃圾堆似的环境下，这种材料的20%将在18天内消失。

youdao