1、Committing treasonous acts against one's own country is a serious offense that may lead to severe consequences.

对自己的国家犯下叛国行为是一项严重的罪行，可能会带来严厉的后果。

2、The leaked documents revealed the treasonous activities of the spy within the government.

泄露的文件揭示了政府内部间谍的叛国活动。