游击队陷入了困境，因此他们不得不转入地下。

The guerrilla force fell in trouble, so they had to go under.

1981年的暴力冲突之后，他们要么转入地下了，要么离开了这个国家。

After the violent clashes of 1981 they either went underground or left the country.

在巴西这种模式下，高额的税费迫使企业转入地下，反复无常，毫无逻辑的规章制度更让企业不胜其扰。

The Brazilian formula is to crowd out enterprise or drive it underground with excessive spending and taxation, then to harass it further with capricious, nonsensical regulation.

科学技术将会被迫转入地下，人类所倚仗的负有责任心的科学家们将会创造一些难以被轻易利用的防御体系。

It would just drive these technologies underground, where the responsible scientists who we're counting on to create the defenses would not have easy access to the tools.