submarine

a.海里的

subheading, subject, subject to, subject-matter, subjection, subjective, subjectively, subjectivity, subjoin, subjugate, subjugation, subjunctive, sublease, sublet, sublimate, sublimation, sublime, sublimely, subliminal, sublimity, submariner, submerge, submerged, submergence, submersible, submission, submissive, submissively, submissiveness, submit, subnormal, suboptimization, suborbital, subordinancy, subordinate, subordination, suborn, subornation, subpoena, subroutine,