重重

他面临重重困难

tā miànlín chóngchóng kùnnan

The air is filled with an unpleasant odor

经过重重考验，他终于成功了

jīngguò chóngchóng kǎoyàn, tā zhōngyú chénggōng le

He faces numerous difficulties

她重重地叹了一口气

tā chóngchóng de tàn le yì kǒu qì

After going through many tests, he finally succeeded