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Hum, I have to think much.
Though I expected that the MS guys helped my reactions, she said 'You should try. I think it is tough.'
Oh my gosh, it means she gives me some suggestions, but I have to do my experience by myself.
OK, I try. Let me know, someone knows how to figure out CH4/CH3D ratio by GC.

Before my dinner, I went cycling to the hill. Yesterday was so hot and I could not help stopping on the way, three or four times.
This evening was good and I climbed the hill with one stop.
Tomorrow I will go without stop.