Contact lens wearers should be aware that the controlled air in the passenger cabin of an aircraft has very little humidity, and can cause eye irritation. Travel professionals recommend that contact lens wearers switch to eyeglasses when they board a plane. Also be aware that large liquid amounts of contact lens fluid will not be allowed on aircraft. Check with each airline before your fly regarding the amount of liquid allowed on each flight, as restrictions change often.

make an effort

Dianne: I have a friend-of-a-friend visiting from Finland tomorrow. But I’m worried because he only speaks Finnish.

Walter: My cousin’s wife is Finnish. I could make an effort to contact her and ask if she can help.

Dianne: Could you do that? It would be great if she could help out.

Explanation: To “make an effort” to do something means to try to help, but it also means that there isn't a guarantee of success.

rehydration

Patient: What is wrong with my child?

Doctor: He has been dehydrated from the physical exercise and the dry air on the airplane flight. We'll give him some liquids via IV and he should respond well to the rehydration.

Explanation: "Rehydration" means to replace and restore the water levels in the body.  It is used commonly when someone has gone through physical stress in a hot climate and needs more water.

fall short of…

Dear Peter:
We read over the offer from your company for supplying blood testing equipment. We are interested in the equipment, but we think your offer falls short of our needs. We require much more accurate testing equipment.

Explanation:
To "fall short" of something means that the effort is not enough to reach the goal.