These conditions necessitate the use of optics with good light gathering ability, i.e.

No surfaces to be used which necessitate the use of stays.

This will necessitate the use of the bevel in laying off the shoulders of the tenons.

To go any deeper would necessitate the use of nuclear warheads, or huge amounts of dynamite.

Poor ventilation and stronger heat stress in such informal housing could necessitate the use of AC.

Effective anti cancer strategies necessitate the use of agents that target tumor cells rather than normal tissues.

Retention of urine may result from spasm of the urethral muscles, and necessitate the use of the catheter.

Ideally, this will jam that sucker in deep and necessitate the use of a nut tool for extraction.

Ideally, this knot will be welded from the carriage of weight and will necessitate the use of teeth to undo.

For convenience we show the post F insulated, so as to necessitate the use of wire (N) from post (F) to binding post (B').

Also, not all patients respond adequately, necessitating the use of additional treatments.

The bow was well known; and this must have necessitated the use of arrows.

The first requisite for cooking purposes is heat; this necessitates the use of fuel.

Birth control necessitates the use of co-ordinating political intelligence.

This necessitated the use of a safety pin.

She was, however, slightly lame of one foot, which necessitated the use of a cane when walking.