Therefore the box containing lead was more difficult to control and it felt heavier".
That's one of the reasons it was so difficult to control and got as large as it is.
Today, of course, milk is no longer left to ripen; the results are difficult to control and not always desirable.
The reaction of benzene with fluorine is difficult to control and gives a mixture of polyfluorinated derivatives of cyclohexane (C6H12).
This means drug dosage is difficult to control and many caregivers struggle to regularly administer the bitter-tasting, sharp-edged tablet fragments for the usual six-month course.
"The potential sharp rise in long-term interest rates could prove difficult to control and might undermine the recovery (including through effects on financial stability and investment).
The majority of these, however, were eventually converted to oil, since the early arc lamps were difficult to control and costly to operate.
The turbulence is more difficult to control, and the overhead gantries impose restrictions on masts and other superstructures of a vessel.
For many years, compared with conventional aircraft, helicopters were underpowered, difficult to control, and subject to much higher dynamic stresses that caused material and equipment failures.
His left foot is difficult to control and Mr. Hughes still wears a leg brace more than three years after the accident.
However, some have defended the local authorities, pointing out the sheer number of people can be difficult to control and predict.
