人们: people...
产量: output...
保密: to keep sth confidential, to maintain secrecy...
胃: stomach...
公斤: kilogram (kg)...
后头: behind, the back, the rear, later, afterwards, (in) the future...
不过: only, merely, no more than, but, however, anyway (to get back to a previous topic), cannot be more (after adjectival)...
考验: to test, to put to the test, trial, ordeal...
模拟: imitation, to simulate, to imitate, analog (device, as opposed to digital)...
铁路: railroad, railway...
