31.   The crew is split up into two research teams, taking shifts for round-the-clock experiments.

v. + shift >>共 349
work 5.41%
reflect 4.88%
make 4.13%
mark 3.46%
see 3.16%
signal 2.63%
represent 2.48%
take 2.33%
cause 2.10%
miss 1.50%
take + n. >>共 753
place 12.16%
part 5.04%
action 3.23%
advantage 2.92%
time 2.33%
control 1.68%
effect 1.66%
office 1.51%
step 1.35%
lead 1.11%
shift 0.02%
每页显示:    共 31