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Sphere = getObject("Sphere")
bullet = getClone(Sphere)

function onSceneUpdate()

    pos = getPosition(bullet)
    print("x="..pos[1].." y="..pos[2].." z="..pos[3]) --checking.
    translate(bullet, {0, 1, 0}, "local")

end

--you can do this:
triggers = {getObject("trigger1"),getObject("trigger2"),getObject("trigger3")}

--But better to do it through the loop.
triggers = {}
num_triggers = 3    --the number of triggers.
for i=1,num_triggers do
    triggers[i] = getObject("trigger"..i)
end
--it's the same thing, if done manually:
--triggers[1] = getObject("trigger1")
--triggers[2] = getObject("trigger2")
--triggers[3] = getObject("trigger3")

function onEnterTrigger(trigger,entity)
    if isCollisionBetween(trigger, entity) then --if collision
        return true
    end
end

cubes = {}
num_cubes = 3
for i=1,num_cubes do
    cubes[i] = getObject("cube"..i)
end

function onSceneUpdate()
    for i=1,#triggers do
        if onEnterTrigger(triggers[i],cubes[i]) then
            deactivate(cubes[i])
        end
    end
end

function getLength2d(vec)
    ...
end
function normalize2d(vec)
    ...
end
function lookAt(object, dir, rotSpeed)
    ...
end
obj1 = getObject("obj1")
obj2 = getObject("obj2")

function onSceneUpdate()
    dir = getPosition(obj2)
    lookAt(obj1, dir, 1)
end