I am learning japanese too, but I am a chinese, so 音読み is not so difficult for us, for it is similar with chinese pronunciation.

It is not difficult for us to remember 音読み、I thought it would be not difficult for you to remember 訓読み、it is similar with English words, isn't it? Or, are you referring to how to remember how to write and read 50 kanas?

Like if there is a screw loosen, if run at a low speed, the screw wouldn't come out. But if it is at a high speed, the screw would come out, and the train become dangerous. 不明显的因素means if you look for it in a really careful way, you can find it. But if you don't deliberately do that, you can't notice that there is a such factor which will influence the train so much. Not really for the screw, but only a example.

I feel 计量 is a noun, the phrase I can recall is 计量单位，a standard of measurement. And it occurs in the situation that related with scientific research more. It is also a verb for 精确计量, also for research or engineering. Simple 计量 is not often seen I feel. 测量, maybe used in primary school students' book. Not very oral, but it is used in daily situation, not so professional. And the oral one is 量。量一下有多长。measure how long it is.

我想有时间的时候，一边喝咖啡，一边看杂志和书。因为我大学时有课，不能慢慢看。还有最近打工也很忙。我想在家里悠闲地过周末！

我在学日语，如果你有兴趣的话，可以加个好友吗？

为什么旅かえる很受欢迎？

为什么旅かえる很受欢迎？
1· 像小时候养动物那样。
2.青蛙随便行动很有意思。
3.日本不同地方的观光图片很好看。
4.像养孩子一样。
日本的孩子们喜欢战斗游戏。
下载的人百分之九十是中国人，百分之二是日本人，百分之一是美国人。
为什么日本人不喜欢旅かえる的软件？

另外，我正在学习日语。如果有兴趣的话，可以加个好友吗？

私は日本語を勉強している。約n３ｎ２のレベルです。興味がありながら、友達になってください。