2. Từ điển
3. Từ vựng theo chủ đề
4. Thời gian

• back
• critical path
• dawdle
• distance
• drowse
• elapse
• extend
• flight
• for
• get down
• glider
• go
• go by
• go on
• hand
• hang
• hung
• idle
• in
• intercalary
• lapse
• linger
• minute
• prolongation
• run on
• second
• service meter
• slip
• sparking distance
• statistical lag
• straight-time
• time cycle
• tract
• unit interval
• unoccupied
• wear
• wore