从上游的材料选择即开始严格把关，如选取上等雪茄烟叶品种，在适宜的地理位置、土壤质量、气候条件下种植。
Upstream from the choice of materials began to strict checks, such as selecting high quality cigar tobacco variety, in a suitable location, soil quality, climate conditions of cultivation.
如果我们选取适宜的食物我们能够有健康的饮食习惯。
针对本课题的关键：选取合适的材料作为长周期光栅的表面敏感膜，并根据反应原理确定适宜的反应条件。
The key point of this task is to choose a proper material and adopt appropriate reaction conditions accordingly.
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