It could mean that he ejaculates only seconds after his penis goes into the vagina, or he could even ejaculate prior to penetration. 可意味着在阴茎进入阴道后几秒钟就射精,或者干脆在进入前就已射精。
ejaculate
[ noun ]
the thick white fluid containing spermatozoa that is ejaculated by the male genital tract
Ejaculate \E*jac"u*late\, v. t. [imp. & p. p. {Ejaculated}; p. pr. & vb. n. {Ejaculating}.] [L. ejaculatus, p. p. of ejaculari to throw out; e out + ejaculari to throw, fr. jaculum javelin, dart, fr. jacere to throw. See {Eject}.] 1. To throw out suddenly and swiftly, as if a dart; to dart; to eject. [Archaic or Technical]
Its active rays ejaculated thence. --Blackmore.
2. To throw out, as an exclamation; to utter by a brief and sudden impulse; as, to ejaculate a prayer.
Ejaculate \E*jac"u*late\, v. i. 1. To utter ejaculations; to make short and hasty exclamations. [R.] ``Ejaculating to himself.'' --Sir W. Scott.
2. to eject semen; -- of a male animal (esp. a human or other mammal) during coitus. [PJC]