for example; for instance; e.g.
physiological phenomenon; physiological response
to be effective; to take effect; to work; to function well; to be possible (to do, use, etc.); to be able to
inconvenience; inexpediency; unhandiness
battle; fight; fighting; engagement; contest
barren; sterile; infertile; unproductive (e.g. discussion); fruitless
different opinion; objection
to pass (the night); to spend; to reveal; to divulge; to prove; to verify
consumption; expenditure; spending
usual; ordinary; normal; regular; general; common
you could say that; that might be so
looking pale; looking unwell
(practical) experience; personal experience; hands-on experience; first-hand experience
slipping out (a chuckle, giggle); unintentionally (letting out a quiet laugh)
serious look (on one's face); straight face
that's a different matter; that's a different story
not to mention ...; needless to say ...; not to speak of ...; (arch.) negligent; (arch.) neglectful; (arch.) careless
practice; training; drill; (an) exercise; workout
cannot be helped; unavoidable
(outward) looks; features; face; countenance; expression
somewhat; to some extent; to some degree; some; part; portion
to soften; to moderate; to relieve
superior; excellent; brilliant; outstanding
to profit; to benefit (from); to benefit (someone or something); to be beneficial to; to make good use of; to take advantage of
to be affected; to be theatrical; to be pompous
to bite at; to snap at; to jump at (e.g. an offer); to snap at; to hold on to; to cling to
because; the reason is; if you want to know why
to roll around laughing; to fold up; to hold one's sides with laughter
to stifle a laugh; to hold back a laugh
what; so-and-so; such and such; what?; wait; well, well
hole; opening; pit; hollow; burrow; den; deficit
tear; tears; lachrymal secretion; sympathy
persistent; obstinate; tenacious; relentless; insistent; importunate
stubbornly; firmly; determinedly; obstinately; resolutely; adamantly
entering; entrance; attendance; audience; containing; income; earnings
to declare; to speak out; to warn; to spit out (words)
to be a matter of life or death; to be life-threatening
plausible; believable; solemn; dignified; serious