暗あん黒こく期き

noun

eclipse period; eclipse phase

Virology term for the stage in a viral lifecycle after entry into a host cell when no complete virions are detectable.

• ウイルスは宿しゅく主しゅ細さい胞ぼうに侵しん入にゅうした後あと、暗あん黒こく期きに入はいる。

  After entering the host cell, the virus enters the eclipse period.

noun

dark age

Metaphorical use for a period of stagnation, decline, or obscurity, often in historical or cultural contexts.

• その文ぶん明めいは数すう世せい紀きにわたる暗あん黒こく期きを経けい験けんした。

  That civilization experienced a dark age lasting several centuries.