Anybody who set himself up as king, without being appointed king by the Senate, that was itself an act of treason.

任何人自称为王，而不受元老院册封，那就是叛国罪。

youdao

No person shall be convicted of treason unless on the testimony of two witnesses to the same overt act, or on confession in open court.

无论何人，除根据两个证人对同一明显行为的作证或本人在公开法庭上的供认，不得被定为叛国罪。

youdao

Practitioners within the oil industry tell me they feel it is almost an unspoken act of treason to profess doubts on peak oil.

FORBES: Magazine Article

As the anti-colonial rebellion took hold in the 1950s, his refusal to join the bien pensant call for independence was considered an act of treason by the French left.

ECONOMIST: In search of the real Camus

The two Cubans had committed a potential act of treason: Though promised to faltering Zimbabwe on behalf of the Cuban government, they had left the mission days earlier, escaping to a local's home.

FORBES: Magazine Article